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 A089249 #2 Mar 31 2012 20:25:01 %S A089249 1,3,4,6,16,11,10,40,55,26,15,80,165,156,57,21,140,385,546,399,120 %N A089249 Triangular array read by rows illustrating the connection between A000522 and A008292. %C A089249 The general case corresponding to other diagonals of A046802 can be derived from A046802(m,n) = Sum C(m-1,n-1) * A008292(m-r,n-1). %e A089249 The fifth row of the array is 15 80 165 156 57 resulting from A089249 (1 4 11 26 57 ) times ( 15 20 15 6 1) %Y A089249 Row sums = the third diagonal of A046802. %Y A089249 Cf. A000522, A008292, A046802, A066810, A089072. %K A089249 easy,nonn,tabl %O A089249 1,2 %A A089249 _Alford Arnold_, Dec 11 2003