# [math-fun] Unsolved? problem.

Robert G. Wilson v rgwv at rgwv.com
Thu Apr 14 18:52:25 CEST 2005

```Sequence Fans,

I computed the first 16000 plus terms of A003508. Here are some terms
along the way.

Sincerely yours,

Bob Wilson.

a(   10)= 24,
a(   20)= 114,
a(   30)= 335,
a(   40)= 857,
a(   50)= 1628,
a(   60)= 2519,
a(   70)= 3894,
a(   80)= 9108,
a(   90)= 17108,
a(  100)= 22869,
a(  200)= 2445920,
a(  300)= 94997426,
a(  400)= 2549908368,
a(  500)= 22159357033,
a(  600)= 325180965093,
a(  700)= 933324713106,
a(  800)= 3638534813074,
a(  900)= 14136547268574,
a( 1000)= 250727160105520,
a( 2000)= 60871448806354932838,
a( 3000)= 242716795332571446135045,
a( 4000)= 297803682263070981314482921,
a( 5000)= 425206306029958511853562109954,
a( 6000)= 654735123526944351014236446448369,
a( 7000)= 2478365783918058509195834524445493205,
a( 8000)= 341353658459502665674437417732819402062,
a( 9000)= 132244013920657437194370341930498623100965,
a(10000)= 453185394868998102449675025681188180224195513,
a(11000)= 25287302770713676843601941021075178089842910282,
a(12000)= 1347566911025156832799501708847337589955463920243,
a(13000)= 37773930567925322154076886779752886851697471726769,
a(14000)= 2963624771882488260090449754070574108993625077357180,
a(15000)= 195127226259272644500692858305344470308514938738412373,
a(16000)= 74961114160994955146806628734532839414418609604272168692
a(16100)= 81602070774174752297719931680372898008771640135951096635,
a(16200)= 115422725517435869352690382940119786947752765981175884089,
a(16300)= 173995571377303938240192923153589214871559051298845801042,
a(16310)= 174009933380392640224415740339441629982029709612695788033,
a(16320)= 174020792662410356588061371880929191745275263476660777223,
a(16330)= 174020792662422159457937782074787488920087926794326738005,
a(16340)= 174023980325818610297677592299026998151708796509043049825,
a(16350)= 174023980325818715675815340181457885642885543210752560560,

```