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 A339985 #6 Dec 26 2020 02:48:39
%S A339985 0,0,0,0,1,2,6,14,37,90,232,584,1512,3906,10246,26984,71766,191852,
%T A339985 516400,1396760,3797435,10367628,28420466,78183462,215791426,
%U A339985 597368222,1658233794,4614679792,12872125836,35982713314,100787606966,282832173830,795070060983
%N A339985 G.f.: g(x)^2 * g(x^2), where g(x) is the g.f. of A000081.
%H A339985 Vaclav Kotesovec, <a href="/A339985/b339985.txt">Table of n, a(n) for n = 0..2000</a>
%F A339985 a(n) ~ 2 * A339986 * A051491^n / n^(3/2).
%t A339985 max = 30; A000081 = Rest[Cases[ Import["https://oeis.org/A000081/b000081.txt", "Table"], {_, _}][[All, 2]]]; g81 = Sum[A000081[[k]]*x^k, {k, 1, max}]; g81x2 = Sum[A000081[[k]]*x^(2*k), {k, 1, max}]; CoefficientList[Series[g81^2 * g81x2, {x, 0, max}], x]
%Y A339985 Cf. A000081, A217781, A339984.
%K A339985 nonn
%O A339985 0,6
%A A339985 _Vaclav Kotesovec_, Dec 25 2020