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A131910
Central terms of triangle A131909.
1
1, 1, 3, 8, 26, 79, 274, 964, 3496, 12664, 46157, 168240, 615173, 2256669, 8321911, 30871862, 115280183, 433247309, 1638036186, 6225871432, 23769249188, 91077899373, 350002189936, 1348065993111, 5201249282212, 20094668668700
OFFSET
0,3
FORMULA
a(n) = A131909(2n,n) for n>=0.
PROG
(PARI)
CROSSREFS
Cf. A131909.
Sequence in context: A317852 A306485 A148801 * A205775 A331320 A148802
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 26 2007
STATUS
approved