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A132847 Column 1 of triangle A132845. 5
1, 2, 9, 42, 270, 1785, 13657, 108606, 943677, 8534290, 82099523, 819569205, 8575756709, 92782439316, 1042810799150, 12077608219410, 144446181373140, 1774918640030754, 22425992057948620, 290381947113460848 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n) = A132844(2n+1,1) = A132844(2n+2,1).

PROG

(PARI)

CROSSREFS

Cf. triangles: A132845, A132844; other columns: A132846, A132848, A132849.

Sequence in context: A347996 A092239 A222472 * A275620 A121365 A018960

Adjacent sequences:  A132844 A132845 A132846 * A132848 A132849 A132850

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Sep 17 2007

STATUS

approved

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Last modified October 27 15:27 EDT 2021. Contains 348287 sequences. (Running on oeis4.)