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A121892 Row sums of triangle in A066094. 0
1, 2, 4, 24, 192, 1920, 23040, 322560, 5160960, 92897280, 1857945600, 40874803200, 980995276800 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

FORMULA

a(0)=1, a(1)=2, a(n)=A000165(n)/2 for n>1.

a(n)=A032107(n), n>0. - R. J. Mathar, Jun 05 2008

G.f.: 1 + x + x/Q(0), where Q(k) = 1 - 4*x*(2*k+1) - 4*x^2*(2*k+1)*(2*k+2)/( 1 - 4*x*(2*k+2) - 4*x^2*(2*k+2)*(2*k+3)/Q(k+1) ) ; (continued fraction). - Sergei N. Gladkovskii, Sep 23 2013

CROSSREFS

Sequence in context: A012292 A211934 A012592 * A032107 A141307 A190655

Adjacent sequences:  A121889 A121890 A121891 * A121893 A121894 A121895

KEYWORD

nonn

AUTHOR

Philippe Deléham, Sep 01 2006

STATUS

approved

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Last modified May 19 23:16 EDT 2019. Contains 323411 sequences. (Running on oeis4.)