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Search: id:A027995
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A027995 a(n)=Sum{T(n,k)*T(n,k+1)}, 0<=k<=2n-1, T given by A027926. +0
1
2, 9, 36, 140, 542, 2100, 8152, 31707, 123542, 482119, 1884060, 7371715, 28874778, 113213129, 444285136, 1744931000, 6858286418, 26974115244, 106157250796, 418025117820, 1646975313678, 6492134765114, 25602897974056 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A134759 A007946 A135593 this_sequence A077836 A003125 A055841

Adjacent sequences: A027992 A027993 A027994 this_sequence A027996 A027997 A027998

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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