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A024496 (3/(8n-4))*C(4n,n). 0
3, 7, 33, 195, 1292, 9177, 68310, 525915, 4153380, 33460284, 273904969, 2271800037, 19050406788, 161242554550, 1375709203260 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

FORMULA

G.f.: (g+2)*(g-1)/g^2 where g = 1+x*g^4 is the g.f. of A002293. - Mark van Hoeij, Nov 11 2011

CROSSREFS

Sequence in context: A057795 A054935 A208989 * A081890 A192880 A318444

Adjacent sequences:  A024493 A024494 A024495 * A024497 A024498 A024499

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified February 22 16:25 EST 2019. Contains 320399 sequences. (Running on oeis4.)