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 A154960 #5 Jun 24 2012 11:15:43 %S A154960 1,1,1,4,3,1,32,25,6,1,436,340,85,10,1,9012,7026,1755,215,15,1,262760, %T A154960 204862,51156,6265,455,21,1,10270696,8007602,1999620,244811,17780,854, %U A154960 28,1,518277560,404077632,100904602,12353796,896931,43092,1470,36,1 %N A154960 Triangle read by rows: matrix inverse of A154959. %C A154960 First column is A005121. %C A154960 Second column is A154961. %e A154960 Triangle starts %e A154960 1, %e A154960 1, 1, %e A154960 4, 3, 1, %e A154960 32, 25, 6, 1, %e A154960 436, 340, 85, 10, 1, %e A154960 9012, 7026, 1755, 215, 15, 1, %e A154960 262760, 204862, 51156, 6265, 455, 21, 1, %e A154960 10270696, 8007602, 1999620, 244811, 17780, 854, 28, 1, %e A154960 518277560, 404077632, 100904602, 12353796, 896931, 43092, 1470, 36, 1 %K A154960 nonn,tabl %O A154960 1,4 %A A154960 _Mats Granvik_, Jan 18 2009