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 A163312 #8 Jun 02 2025 01:48:07 %S A163312 1,3,8,17,34,64,114,195,325,529,840,1303,1977,2940 %N A163312 Row sums of triangle A163311. %C A163312 Triangle A163311 by diagonals = the infinite set of Toothpick sequences. %H A163312 David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="/A000695/a000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.] %H A163312 N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a> %F A163312 a(n) = sum of n-th row terms, triangle A163311 %e A163312 a(4) = 17 = (1, + 4 + 7, + 5). %Y A163312 A163311 %K A163312 nonn %O A163312 1,2 %A A163312 _Gary W. Adamson_, Jul 24 2009