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 A091604 #5 Dec 26 2023 18:11:18 %S A091604 1,2,1,4,0,1,6,4,0,1,10,4,2,0,1,17,8,4,2,0,1,25,12,7,2,2,0,1,38,25,9, %T A091604 7,2,2,0,1,57,33,19,8,5,2,2,0,1,84,57,27,16,8,5,2,2,0,1,120,81,46,22, %U A091604 15,6,5,2,2,0,1,174,129,68,41,19,15,6,5,2,2,0,1,243,182,107,56,36,18,13,6 %N A091604 Matrix square of triangle A091602. %e A091604 1; 2,1; 4,0,1; 6,4,0,1; 10,4,2,0,1; ... %Y A091604 Cf. A091602, A091610 (row sums), A091611 (column 1). %K A091604 nonn,tabl %O A091604 1,2 %A A091604 _Christian G. Bower_, Jan 23 2004