50k

[N. J. A. Sloane]

actually the total number right now is 49582, but it should reach 50K by
the end of the summer

the sheer number of sequences submitted by any one
person isn't that interesting, i think.  what matters is the
quality.

this one for example is still one of my favorites:


%I A011784
%S A011784 1,2,2,3,4,7,14,42,213,2837,175450,139759600,6837625106787,
%T A011784 266437144916648607844,508009471379488821444261986503540
%N A011784 Row 1 is {1,1}; if row n is {r_1, ..., r_k} then row n+1 is {r_k 1's, r_{k-1} 2's, r_{k-2} 3's, etc.};
sequence consists of final element in each row.
%K A011784 nonn,nice,huge
%O A011784 1,2
%A A011784 Lionel Levine (levine at ultranet.com)
%Y A011784 Cf. A012257.
%H A011784 <a href="http://www.research.att.com/~njas/sequences/Shot.html#LEVINE">More info</a>
%e A011784 {1,1}, {1,2}, {1,1,2}, {1,1,2,3}, {1,1,1,2,2,3,4}, {1,1,1,1,2,2,2,3,3,4,4,5,6,7}
%E A011784 a(12) from C. L. Mallows (clm at research.att.com), a(13) from njas, a(14) and a(15) from Allan Wilks.

i would really like one more term, if someone can calculate it!

for the history of the database, and more interesting sequences,
see the paper "My favorite integer sequences", on my home page.

just for the record, it's maintained by me alone these days


 Neil J. A. Sloane, njas at research.att.com,
 AT&T Shannon Lab, 180 Park Ave, Room C233,
 Florham Park, NJ 07932-0971 USA.
 Home page: http://www.research.att.com/~njas/
 Office: (973) 360 8415; fax: (973) 360 8178; virtual office: (732) 828 6098