This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A088215 #11 Jul 10 2015 23:05:11 %S A088215 76,32,18,30,14,47,30,25,10,41,20,42,32,25,16,36,14,31,39,28,35,39,20, %T A088215 22,18,33,19,45,12,21,37,26,15,41,25,37,29,27,18,34,22,24,23,24,17,48, %U A088215 16,16,18,15,25,35,16,21,36,43,11,30,5,18,31,17,13,28,11,42,35,24,13,35 %N A088215 (1/36)*number of ways to express n as the determinant of a 3 X 3 matrix with elements 1..9. %C A088215 0 can be expressed in 36*76=2716 ways as the determinant of a 3 X 3 matrix which has elements 1..9. One such way is e.g. det ((1 2 3)(4 5 6)(7 8 9))=0. All numbers between -323 and +323 can be expressed by such a determinant. The first number not expressible is given by A088216. %H A088215 Hugo Pfoertner, <a href="/A088215/b088215.txt">Table of n, a(n) for n = 0..412</a> [Gives all terms] %H A088215 Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a088215.pdf">Possible determinants of 3 X 3 matrix with elements 1..9.</a> %Y A088215 Cf. A085000, A088214, A088216, A088217. %Y A088215 Cf. A136608 [analogous sequence for 4 X 4 matrices]. %K A088215 fini,full,nonn %O A088215 0,1 %A A088215 _Hugo Pfoertner_, Sep 23 2003