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A127636 Hankel transform of C(3n,n), A005809. 1
1, 6, 99, 4590, 601749, 223671780, 236051526780, 707876792166456, 6035175245831686020, 146337688589606021286324, 10094030504239191283895044707, 1981045079056219549583047340549844 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..11.

FORMULA

a(n)=3^n*A051255(n).

CROSSREFS

Sequence in context: A224615 A138913 A192667 * A281502 A226413 A226344

Adjacent sequences:  A127633 A127634 A127635 * A127637 A127638 A127639

KEYWORD

nonn

AUTHOR

Paul Barry, Jan 21 2007

STATUS

approved

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Last modified July 2 08:02 EDT 2020. Contains 335398 sequences. (Running on oeis4.)