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 A326505 #9 Feb 16 2025 08:33:58
%S A326505 1,1,2,5,7,11,17,27,34,50,65,94,110,154,182,250,279,375,420,555,601,
%T A326505 781,847,1085,1152,1456,1547,1932,2024,2500,2620,3204,3325,4029,4182,
%U A326505 5025,5179,6175,6365,7535,7726,9086,9317,10890,11122,12926,13202,15262,15539
%N A326505 Number of (binary) max-heaps on n elements from the set {0,1} containing exactly four 0's.
%H A326505 Alois P. Heinz, <a href="/A326505/b326505.txt">Table of n, a(n) for n = 4..10000</a>
%H A326505 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Heap.html">Heap</a>
%H A326505 Wikipedia, <a href="https://en.wikipedia.org/wiki/Binary_heap">Binary heap</a>
%H A326505 <a href="/index/Rec#order_13">Index entries for linear recurrences with constant coefficients</a>, signature (1,2,-2,1,-1,-4,4,1,-1,2,-2,-1,1).
%F A326505 G.f.: -x^4*(2*x^3-x^2+1)*(2*x^6-x^5-x^4+x^3+1)/((x^2+1)^2*(x+1)^4*(x-1)^5).
%Y A326505 Column k=4 of A309049.
%K A326505 nonn,easy
%O A326505 4,3
%A A326505 _Alois P. Heinz_, Jul 09 2019