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Used by Polya in calculating A000598.
1

%I #11 Nov 21 2020 17:04:30

%S 0,0,0,0,0,0,1,5,19,63,184,503,1300,3229,7748,18106,41327,92521,

%T 203601,441466,944618,1997726,4180405,8665024,17805427,36299704,

%U 73468100,147704332,295122569,586304222,1158582080,2278084748,4458522727

%N Used by Polya in calculating A000598.

%H 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^{II}(x) on p. 441.

%H 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^{II}(x) on p. 441. (Annotated scanned copy)

%F G.f.: x * q(x) * (2*q(x)*p(x^2) + (q(x)^2-q(x^2)) * p(x)) / 2 where p(x) is the g.f. for A036676 and q(x) is the g.f. for A000621 with offset 0 [from Polya]. - _Sean A. Irvine_, Nov 21 2020

%K nonn

%O 0,8

%A _N. J. A. Sloane_.