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A055192 Number of bipartite graphs with n vertices, no isolated vertices and a distinguished bipartite block, up to isomorphism. 7
1, 2, 5, 12, 35, 108, 393, 1666, 8543, 54190, 436740, 4565450, 62930604, 1156277748, 28509174012, 946786816168, 42448800498744, 2573207315483554, 211180300735118954, 23490473719472829824, 3545759835559406756008, 727077827560669587718290 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

Also the number of connected split graphs on n vertices (cf. A048194). - Falk Hüffner, Dec 01 2015

Inverse Euler transform is A007776. - Andrew Howroyd, Oct 03 2018

LINKS

Alois P. Heinz, Table of n, a(n) for n = 2..40

CROSSREFS

Equals second differences of A049312.

Cf. A007776, A024206, A055609, A055082, A055083, A055084.

Row sums of A056152 and also of A122083.

Sequence in context: A036357 A000104 A000105 * A108555 A292169 A283799

Adjacent sequences:  A055189 A055190 A055191 * A055193 A055194 A055195

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jun 18 2000

STATUS

approved

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Last modified October 22 23:18 EDT 2018. Contains 316518 sequences. (Running on oeis4.)