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 A373511 #16 Jun 11 2024 08:30:43
%S A373511 1,1,1,1,1,1,1,1,8,15,22,29,36,43,50,253,505,806,1156,1555,2003,2500,
%T A373511 9906,20105,33440,50254,70890,95691,125000,423270,861190,1467915,
%U A373511 2275001,3316405,4628485,6250000,18944976,38420768,66538494,105430585,157517592,225524993,312500000
%N A373511 Expansion of 1/(1 - x/(1 - 49*x^7)^(1/7)).
%F A373511 a(7*n) = 50^(n-1) for n > 0.
%F A373511 a(n) = Sum_{k=0..floor(n/7)} 49^k * binomial(n/7-1,k).
%F A373511 a(n) == 1 (mod 7).
%o A373511 (PARI) a(n) = sum(k=0, n\7, 49^k*binomial(n/7-1, k));
%Y A373511 Cf. A066872, A098615, A371458, A373510.
%K A373511 nonn
%O A373511 0,9
%A A373511 _Seiichi Manyama_, Jun 07 2024