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 A373189 #8 May 27 2024 09:56:29
%S A373189 1,3,6,11,15,21,28,39,45,55,66,84,91,105,120,147,153,171,190,225,231,
%T A373189 253,276,321,325,351,378,434,435,465,496,567,561,595,630,711,703,741,
%U A373189 780,875,861,903,946,1056,1035,1081,1128,1260,1225,1275,1326,1469,1431,1485,1540,1701
%N A373189 Expansion of Sum_{k>=0} x^(4^k) / (1 - x^(4^k))^3.
%F A373189 G.f. A(x) satisfies A(x) = x/(1 - x)^3 + A(x^4).
%F A373189 a(4*n+1) = A000217(4*n+1), a(4*n+2) = A000217(4*n+2), a(4*n+3) = A000217(4*n+3) and a(4*n+4) = A000217(4*n+4) + a(n+1) for n >= 0.
%Y A373189 Cf. A373187, A373188.
%Y A373189 Cf. A000217.
%K A373189 nonn
%O A373189 1,2
%A A373189 _Seiichi Manyama_, May 27 2024