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A298012
a(0)=a(1)=0; thereafter a(n) =
A162973
(n)/(n1).
0
0, 0, 1, 1, 4, 16, 85, 533, 3888, 32268, 300193, 3093377, 34970468, 430293488, 5724411845, 81871668773, 1252691817856, 20417647146396, 353169795861921, 6461418976274657, 124664729763630436
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OFFSET
0,5
LINKS
Table of n, a(n) for n=0..20.
John Riordan,
Letter to N. J. A. Sloane, Sep 26 1980 with notes on the 1973 Handbook of Integer Sequences
. Note that the sequences are identified by their Nnumbers, not their Anumbers.
FORMULA
Riordan gives a recurrence.
CROSSREFS
Sequence in context:
A125793
A121145
A144882
*
A006681
A074876
A238722
Adjacent sequences:
A298009
A298010
A298011
*
A298013
A298014
A298015
KEYWORD
nonn
AUTHOR
N. J. A. Sloane
, Jan 10 2018
STATUS
approved
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Last modified July 18 07:53 EDT 2024. Contains 374377 sequences. (Running on oeis4.)