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Search: id:A027042
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A027042 a(n) = Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n-1, T given by A027023. +0
2
1, 4, 11, 52, 225, 920, 3695, 14464, 55593, 210776, 789995, 2933380, 10807625, 39556316, 143958335, 521340016, 1879901265, 6753038624, 24176722555, 86294777316, 307179518193, 1090771084252, 3864614381391, 13664531314176 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A149315 A149316 A149317 this_sequence A051770 A032181 A081073

Adjacent sequences: A027039 A027040 A027041 this_sequence A027043 A027044 A027045

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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