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A045990 a(n) = A034997(n)/2. 0
1, 3, 16, 185, 5646, 533022, 173663176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Sequence in context: A254430 A180721 A192668 * A007006 A174137 A166860

Adjacent sequences:  A045987 A045988 A045989 * A045991 A045992 A045993

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)