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A298012 a(0)=a(1)=0; thereafter a(n) = A162973(n)/(n-1). 0
0, 0, 1, 1, 4, 16, 85, 533, 3888, 32268, 300193, 3093377, 34970468, 430293488, 5724411845, 81871668773, 1252691817856, 20417647146396, 353169795861921, 6461418976274657, 124664729763630436 (list; graph; refs; listen; history; text; internal format)
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 N-numbers, not their A-numbers.

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 September 18 23:16 EDT 2021. Contains 347548 sequences. (Running on oeis4.)