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 A137593 #11 Apr 02 2022 09:25:46 %S A137593 1,1,2,1,4,4,1,4,16,12,1,4,16,84,48,1,4,16,156,504,192,1,4,16,156, %T A137593 1464,3312,960,1,4,16,156,1464,14112,24720,5760,1,4,16,156,1464,24912, %U A137593 158640,189360,34560,1,4,16,156,1464,24912,400560,1761840,1607040,241920 %N A137593 Triangle read by rows: matrix product A000012 * A136717. %C A137593 Right border = A004527: (1, 2, 4, 12, 48, 192, ...). %C A137593 Row sums = A007489 starting (1, 3, 9, 33, 153, ...). %F A137593 A000012 * A136717 as infinite lower triangular matrices. %e A137593 First few rows of the triangle: %e A137593 1; %e A137593 1, 2; %e A137593 1, 4, 4; %e A137593 1, 4, 16, 12; %e A137593 1, 4, 16, 84, 48; %e A137593 1, 4, 16, 156, 504, 192; %e A137593 1, 4, 16, 156, 1464, 3312, 960; %e A137593 ... %Y A137593 Cf. A136717, A004527, A007489. %K A137593 nonn,tabl %O A137593 1,3 %A A137593 _Gary W. Adamson_, Jan 28 2008 %E A137593 Typo in eighth row corrected by _Olivier Gérard_, Oct 30 2012