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A027041 Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n, T given by A027023. +0
2
1, 2, 5, 20, 77, 306, 1209, 4656, 17713, 66618, 248025, 916020, 3359789, 12250026, 44435997, 160466304, 577185745, 2068826290, 7392167585, 26338879556, 93609302941, 331924381218, 1174482354493, 4147807582672 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A136897 A098510 A124264 this_sequence A009737 A008983 A012768

Adjacent sequences: A027038 A027039 A027040 this_sequence A027042 A027043 A027044

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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