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A055840 T(2n+6,n), where T is the array in A055830. 1
13, 109, 707, 4184, 23720, 131389, 717927, 3889730, 20959485, 112529350, 602684170, 3222508015, 17211197614, 91855019053, 489986311295, 2612981923560, 13932202684630, 74280962031435, 396042187457445 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..18.

CROSSREFS

Sequence in context: A271560 A142040 A002648 * A243417 A163845 A075143

Adjacent sequences:  A055837 A055838 A055839 * A055841 A055842 A055843

KEYWORD

nonn

AUTHOR

Clark Kimberling, May 28 2000

STATUS

approved

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Last modified November 12 09:29 EST 2019. Contains 329054 sequences. (Running on oeis4.)