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A144659 a(n) = A001516(n)/2. 0
0, 0, 3, 60, 990, 16485, 292215, 5602338, 116549370, 2627202105, 63960690420, 1675359272730, 47031228602358, 1409683851264780, 44956320071089245, 1520493296271210030, 54376042036599780570, 2050556012681642525763, 81336729496634645414265, 3385729099078381669910310 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..19.

FORMULA

Also a(n) = 3*A144507(n).

Also a(n) = Sum_{k} binomial(k-n,2) T(n,k) where T(n,k) is the triangle in A144331.

CROSSREFS

Sequence in context: A002738 A006432 A195550 * A115490 A065889 A183251

Adjacent sequences:  A144656 A144657 A144658 * A144660 A144661 A144662

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 30 2009

STATUS

approved

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Last modified April 8 02:27 EDT 2020. Contains 333312 sequences. (Running on oeis4.)