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A047770 a(n) = A047769(2n). 1
0, 1, 5, 26, 133, 708, 3860, 21604, 123266, 715216, 4206956, 25032840, 150413322, 911379384, 5562367173, 34164355715, 211015212580, 1309815397995, 8166460799097, 51120054233490, 321156223592865, 2024257417808379, 12797201858645100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..23.

CROSSREFS

Sequence in context: A033115 A033123 A331883 * A047757 A047755 A047768

Adjacent sequences:  A047767 A047768 A047769 * A047771 A047772 A047773

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 8 23:02 EDT 2020. Contains 336300 sequences. (Running on oeis4.)