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 A181324 #11 Jun 02 2025 03:13:14
%S A181324 1,1,1,1,1,2,3,4,5,6,8,11,16,22,29,38,50,68,93,126,169,225,302,407,
%T A181324 550,742,997,1339,1799,2421,3261,4390,5906,7941,10680,14371,19341,
%U A181324 26028,35017,47105,63370,85261,114723,154360,207679,279405,375907,505759,680479,915554,1231813
%N A181324 G.f. 1/(1-sum(n=1,N,x^(n*(3*n-1)/2))).
%C A181324 Number of compositions into positive pentagonal numbers (A000326). [_Joerg Arndt_, Jun 10 2011]
%o A181324 (PARI) N=99; x='x+O('x^N);
%o A181324 Vec(1/(1-sum(n=1,N,x^(n*(3*n-1)/2)))) /* show terms */
%Y A181324 A023361 ( g.f. 1/(1-sum(n=1,N,x^(n*(n+1)/2))) ).
%K A181324 nonn
%O A181324 0,6
%A A181324 _Joerg Arndt_, Jan 27 2011