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 A230421 #5 Oct 19 2013 11:00:14 %S A230421 1,1,1,1,2,2,4,4,5,6,12,14,16,19,22,55,59,65,73,82,94,293,314,336,362, %T A230421 395,432,479,1881,1971,2073,2189,2324,2482,2667,2886,14011,14555, %U A230421 15140,15775,16473,17249,18124,19123,20276,115974,120010,124289,128831,133664,138828,144378,150389,156961,164224 %N A230421 Triangle A230420 transposed. %F A230421 a(n) = A230420(A038722(n)). %e A230421 The first rows of this triangular table are: %e A230421 1; %e A230421 1, 1; %e A230421 1, 2, 2; %e A230421 4, 4, 5, 6; %e A230421 12, 14, 16, 19, 22; %e A230421 55, 59, 65, 73, 82, 94; %e A230421 ... %o A230421 (Scheme) %o A230421 (define (A230421 n) (A230420 (A038722 n))) %Y A230421 Transpose: A230420. Row sums: A219661. %K A230421 nonn,base,tabl %O A230421 1,5 %A A230421 _Antti Karttunen_, Oct 18 2013