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A027980 Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n-1, T given by A027960. +0
1
1, 13, 48, 176, 580, 1844, 5667, 17047, 50404, 147090, 424686, 1215528, 3453733, 9752641, 27393240, 76587284, 213260152, 591707612, 1636514439, 4513276555, 12414985996, 34071252918, 93305816418, 255027755856 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A141865 A146806 A135712 this_sequence A013200 A156694 A080171

Adjacent sequences: A027977 A027978 A027979 this_sequence A027981 A027982 A027983

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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