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A052112 Number of self-complementary directed 2-multigraphs on n nodes. 0
1, 2, 14, 159, 7629, 599456, 226066304, 139178815861, 410179495378288, 2055126126323159298, 48234291396964332998082, 2016523952125103590736221923, 382812826011951187177138562992638 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A 2-multigraph is similar to an ordinary graph except there are 0, 1 or 2 edges between any two nodes (self-loops are not allowed).

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Cf. A053467, A003086, A053588.

Sequence in context: A196791 A218295 A268011 * A074635 A201465 A245894

Adjacent sequences:  A052109 A052110 A052111 * A052113 A052114 A052115

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jan 21 2000

STATUS

approved

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Last modified February 20 12:02 EST 2018. Contains 299387 sequences. (Running on oeis4.)