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A026618 T(2n,n-2), T given by A026615. 0
1, 11, 50, 212, 870, 3509, 14014, 55640, 220116, 868870, 3425092, 13491064, 53117350, 209097945, 823111350, 3240499440, 12759776700, 50254414650, 197979380220, 780170359800, 3075303389340 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Sequence in context: A212560 A211920 A167423 * A266034 A026684 A181619

Adjacent sequences:  A026615 A026616 A026617 * A026619 A026620 A026621

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 22 19:49 EST 2019. Contains 320403 sequences. (Running on oeis4.)