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Row sums of triangle in A066094.
0

%I #11 Nov 17 2024 13:22:54

%S 1,2,4,24,192,1920,23040,322560,5160960,92897280,1857945600,

%T 40874803200,980995276800

%N Row sums of triangle in A066094.

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

%F a(n)=A032107(n), n>0. - _R. J. Mathar_, Jun 05 2008

%F 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

%F a(n) = A002866(n) for n>=2. - _Alois P. Heinz_, Nov 17 2024

%Y Cf. A000165, A002866, A032107, A066094.

%K nonn,changed

%O 0,2

%A _Philippe Deléham_, Sep 01 2006