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 A165193 #7 Jan 22 2023 09:16:06
%S A165193 1,4,28,352,7888,319168,23833792,3359617024,911281182976
%N A165193 Eigensequence of triangle A038208.
%F A165193 Given triangle A038208 as an infinite lower triangular matrix: [1; 2,2; 4,8,4; 8,24,24,8;...], shift the triangle down one row, inserting "1" at (0,0) = triangle Q. Then lim:_{n->oo} Q^n generates a one-column vector [1, 1, 4, 28, 352,...] such that A038208 * the vector = [1, 4, 28,...].
%Y A165193 Cf. A038208.
%K A165193 nonn,more
%O A165193 1,2
%A A165193 _Gary W. Adamson_, Sep 06 2009