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 A036676 #13 Jul 08 2025 21:53:59
%S A036676 0,0,0,0,1,3,8,20,46,102,220,461,948,1921,3836,7574,14810,28705,55212,
%T A036676 105485,200300,378262,710795,1329603,2476817,4596297,8499396,15665681,
%U A036676 28786696,52747907,96398485,175735593,319623891,580054269
%N A036676 Used by Polya in calculating A000598.
%H A036676 G. Polya, <a href="http://dx.doi.org/10.1524/zkri.1936.93.1.415">Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen</a>, Zeit. f. Kristall., 93 (1936), 415-443; q^{I}(x) on p. 441.
%H A036676 G. Polya, <a href="/A000598/a000598_3.pdf">Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen</a>, Zeit. f. Kristall., 93 (1936), 415-443; q^{I}(x) on p. 441. (Annotated scanned copy)
%F A036676 G.f.: x * q(x) * (q(x)^3 - 3*q(x)*q(x^2) + 2*q(x^3)) / 6 where q(x) is the g.f. of A000621 with offset 0 [from Polya]. - _Sean A. Irvine_, Nov 21 2020
%K A036676 nonn
%O A036676 0,6
%A A036676 _N. J. A. Sloane_
%E A036676 a(33) corrected by _Sean A. Irvine_, Nov 21 2020