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 A089355 #4 Mar 31 2012 13:23:37 %S A089355 1,1,1,1,2,1,1,1,3,2,4,2,2,1,4,3,8,7,9,5,5,1,1,5,4,13,14,23,20,25,16, %T A089355 14,7,2,1,1,6,5,19,23,44,49,71,65,75,60,48,32,18,6,1,1,7,6,26,34,73, %U A089355 94,154,172,232,234,249,228,195,145,101,59,27,9,2 %N A089355 A quarter-square shaped (A002620) staircase array distributing the frequency of objects counted by A047970. %e A089355 The array begins: %e A089355 1..1..1..1..1..1..1.... %e A089355 ...1..2..3..4..5..6.... %e A089355 ......1..2..3..4..5.... %e A089355 ......1..4..8.13.19.... %e A089355 where the fourth row counts the ordered partitions of type 221^k and type 41^k since (1 3 6 10 15 ...) + (0 1 2 3 4 ...) yields the required result. %K A089355 nonn,tabf %O A089355 1,5 %A A089355 _Alford Arnold_, Dec 26 2003