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A053515 Number of connected directed 3-multigraphs on n nodes. 0
1, 9, 710, 702995, 9167621626, 1601362624429243, 3837877364912125546166, 128777253726443722899317880176, 61454877368531170511811727162658812448, 422314689334495256777424027741114845781285378061 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Cf. A053468.

Sequence in context: A322488 A109061 A282181 * A120816 A161585 A255259

Adjacent sequences:  A053512 A053513 A053514 * A053516 A053517 A053518

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Jan 14 2000

STATUS

approved

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)