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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
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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:
A351881
A222472
A351882
*
A275620
A121365
A018960
Adjacent sequences:
A132844
A132845
A132846
*
A132848
A132849
A132850
KEYWORD
nonn
AUTHOR
Paul D. Hanna
, Sep 17 2007
STATUS
approved
