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 A322855 #6 Feb 16 2025 08:33:57
%S A322855 1,1,1,1,1,1,1,1,2,3,4,5,6,7,8,9,11,14,18,23,29,36,44,53,64,78,97,121,
%T A322855 151,188,233,287,352,431,530,654,809,1002,1241,1535,1895,2335,2876,
%U A322855 3544,4371,5396,6666,8237,10176,12564,15504,19126,23594,29111,35928
%N A322855 Number of compositions (ordered partitions) of n into heptagonal pyramidal numbers (A002413).
%H A322855 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HeptagonalPyramidalNumber.html">Heptagonal Pyramidal Number</a>
%H A322855 <a href="/index/Com#comp">Index entries for sequences related to compositions</a>
%F A322855 G.f.: 1/(1 - Sum_{k>=1} x^(k*(k+1)*(5*k-2)/6)).
%t A322855 nmax = 54; CoefficientList[Series[1/(1 - Sum[x^(k (k + 1) (5 k - 2)/6), {k, 1, nmax}]), {x, 0, nmax}], x]
%Y A322855 Cf. A002413, A279223, A282582, A322340, A322799, A322803, A322853, A322854, A322856.
%K A322855 nonn
%O A322855 0,9
%A A322855 _Ilya Gutkovskiy_, Dec 29 2018