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A054139 T(2n,n), array T as in A054134. 0
1, 4, 18, 97, 570, 3489, 21810, 138044, 881098, 5658793, 36520068, 236619717, 1538134272, 10026366588, 65513185896, 428957025672 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..15.

CROSSREFS

Sequence in context: A234854 A334735 A086681 * A020072 A020027 A263688

Adjacent sequences:  A054136 A054137 A054138 * A054140 A054141 A054142

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified July 13 07:54 EDT 2020. Contains 335685 sequences. (Running on oeis4.)