[seqfan] Re: 3D version of A000938: 3-in-line inside the nXnXn cube

[Ron Hardin]

There are no OEIS sequences with one-bigger grids

3 points in a side-4 2..9 dimensional grid

$ awk '{print FILENAME,$4}' stat??3.txt
stat203.txt 44
stat303.txt 376
stat403.txt 2960
stat503.txt 22624
stat603.txt 171584
stat703.txt 1303936
stat803.txt 9969920
stat903.txt 76793344

4 points in a side-5 2..9 dimensional grid

$ awk '{print FILENAME,$5}' stat??4.txt
stat204.txt 64
stat304.txt 629
stat404.txt 5632
stat504.txt 48485
stat604.txt 410944
stat704.txt 3470549
stat804.txt 29389312
stat904.txt 250334405

so no easy formulogogy.


 rhhardin at mindspring.com
rhhardin at att.net (either)



----- Original Message ----
> From: Ron Hardin <rhhardin at att.net>
> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
> Sent: Sun, May 23, 2010 6:34:55 AM
> Subject: [seqfan] Re: 3D version of A000938: 3-in-line inside the nXnXn cube
> 
> Looking at the number of sets of 4 collinear points in a 2..9 dimensional side-4 
> grid

$ awk '{print FILENAME,$4}' stat??4.txt
stat204.txt 
> 10
stat304.txt 76
stat404.txt 520
stat504.txt 3376
stat604.txt 
> 21280
stat704.txt 131776
stat804.txt 807040
stat904.txt 
> 4907776

you get A016149 and A081199.......