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 A167656 #8 Jun 19 2016 02:48:20 %S A167656 1,1,1,2,4,2,6,16,14,4,22,68,78,40,8,90,304,410,284,104,16,394,1412, %T A167656 2122,1776,896,256,32,1806,6752,10966,10468,6496,2592,608,64,8558, %U A167656 33028,56870,59832,43016,21376,7072,1408,128,41586,164512,296498,336252 %N A167656 Triangle T(n,k), 0<=k<=n, read by rows given by [1,1,2,1,2,1,2,1,2,1,2,...] DELTA [1,1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938. %F A167656 T(n,0) = T(n-1,0) + T(n-1,1). %F A167656 T(n,1) = T(n-1,0) + 3*T(n-1,1) + T(n-1,2). %F A167656 T(n,k) = 2*T(n-1,k-1) + 3*T(n-1,k) + T(n-1,k+1) for k>1. %e A167656 Triangle begins: %e A167656 1 ; %e A167656 1,1 ; %e A167656 2,4,2 ; %e A167656 6,16,14,4 ; %e A167656 22,68,78,40,8 ; %e A167656 90,304,410,284,104,16 ; %e A167656 ... %Y A167656 Cf. A132372, A155069, A006319, A011782. %K A167656 nonn,tabl %O A167656 0,4 %A A167656 _Philippe Deléham_, Nov 08 2009