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 A005723 M4872 #16 Jul 08 2025 16:35:05 %S A005723 1,12,155,2128,30276,440484,6506786,97181760,1463609356,22187304112, %T A005723 338118529539,5175023913008,79492847013100,1224838471521240, %U A005723 18922450356489780,293003808610433280,4546150487318508156,70662280030419277200,1100069396653853657564 %N A005723 Quadrinomial coefficients. %D A005723 L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 78. %D A005723 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005723 R. K. Guy, <a href="/A005712/a005712.pdf">Letter to N. J. A. Sloane, 1987</a> %Y A005723 Bisection of A005190. %K A005723 nonn %O A005723 1,2 %A A005723 _N. J. A. Sloane_