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 A161362 #5 Jun 02 2025 01:43:44 %S A161362 1,372,372,29250,138384,29250,-134120,10881000,10881000,-134120, %T A161362 54261375,-49892640,855562500,-49892640,54261375,-6139293372, %U A161362 20185231500,-3923010000,-3923010000,20185231500,-6139293372 %N A161362 Triangle read by rows, self-convolution of A161361, row sums = A000521. %C A161362 Sum of n-th row terms = A000521(n-1). %F A161362 Antidiagonals of a table, A161361^2, where A161361 = the convolution square root of A000521. %e A161362 First few rows of the triangle = %e A161362 1; %e A161362 372, 372; %e A161362 29250, 138384, 29250; %e A161362 -134120, 10881000, 10881000, -134120; %e A161362 54261375, -49892640, 855562500, -49892640, 54261375; %e A161362 -6139293372, 20185231500, -3923010000, -3923010000, 20185231500, -6139293372; %e A161362 ... %e A161362 The multiplication table by rows: %e A161362 .......1,.......372,.....29250,... %e A161362 .....372,.....38384,..10881000,... %e A161362 ...29250,..10881000... %e A161362 .-134120... %e A161362 ... %e A161362 Take antidiagonals such that row 2 = (29250, 138384, 29250), sum = 196884 %e A161362 = A000521(2). %Y A161362 Cf. A000521, A161362 %K A161362 tabl,sign %O A161362 0,2 %A A161362 Gary W. Adamson and _Alexander R. Povolotsky_, Jun 07 2009