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 A373292 #15 Jun 07 2024 11:14:26 %S A373292 1,1,1,1,3,5,7,19,35,55,139,267,447,1077,2115,3689,8595,17101,30703, %T A373292 69797,140027,256873,573167,1156221,2156555,4742759,9603287,18149083, %U A373292 39457727,80104735,153007747,329580959,670338231,1291649283,2761199459,5623490391 %N A373292 Expansion of 1/(1 - x/(1 - 8*x^3)^(1/4)). %F A373292 a(n) = Sum_{k=0..floor(n/3)} 8^k * binomial((n+k)/4-1,k). %o A373292 (PARI) a(n) = sum(k=0, n\3, 8^k*binomial((n+k)/4-1, k)); %Y A373292 Cf. A373509. %K A373292 nonn %O A373292 0,5 %A A373292 _Seiichi Manyama_, Jun 07 2024