A036676 - OEIS

A036676

Used by Polya in calculating A000598.

0, 0, 0, 0, 1, 3, 8, 20, 46, 102, 220, 461, 948, 1921, 3836, 7574, 14810, 28705, 55212, 105485, 200300, 378262, 710795, 1329603, 2476817, 4596297, 8499396, 15665681, 28786696, 52747907, 96398485, 175735593, 319623891, 580054269

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,6

LINKS

Table of n, a(n) for n=0..33.

G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; q^{I}(x) on p. 441.

G. Polya, Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen, Zeit. f. Kristall., 93 (1936), 415-443; q^{I}(x) on p. 441. (Annotated scanned copy)

FORMULA

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

CROSSREFS

Sequence in context: A027928 A026624 A026690 * A101533 A138803 A048492

Adjacent sequences: A036673 A036674 A036675 * A036677 A036678 A036679

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(33) corrected by Sean A. Irvine, Nov 21 2020

STATUS

approved