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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
OFFSET
0,2
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: A351881 A222472 A351882 * A275620 A121365 A018960
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 17 2007
STATUS
approved