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Search: id:A117266
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A117266 Row sums of triangle A117265. +0
2
1, 2, 6, 37, 497, 14033, 813857, 95996993, 22913626241, 11034472530177, 10699863490757121, 20863301244829828097, 81721932792141693585409, 642577422892784159654154241, 10136733849914528413869372612609 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n) = Sum_{k=0..n} (2*(n-k))!/((n-k)!*(n-k)!)*2^((n-k)*(n+k-3)/2)).

PROGRAM

(PARI) a(n)=sum(k=0, n, (2*(n-k))!/((n-k)!*(n-k)!)*2^((n-k)*(n+k-3)/2))

CROSSREFS

Sequence in context: A014052 A014056 A113375 this_sequence A013033 A027322 A085447

Adjacent sequences: A117263 A117264 A117265 this_sequence A117267 A117268 A117269

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Mar 14 2006

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.


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