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Number of separate orbits/cycles to which the Catalan bijections A072796/A072797 partition each A000108(n) structures encoded in the range [A014137(n-1)..A014138(n-1)] of the sequence A014486/A063171.
8

%I #3 Oct 17 2015 08:36:23

%S 1,1,2,4,11,31,96,305,1007,3389,11636,40498,142714,507870,1823040,

%T 6591885,23989419,87795473,322922652,1193058230,4425547638,

%U 16475756738,61539293424,230548633954,866095934598,3261868457698,12313423931624

%N Number of separate orbits/cycles to which the Catalan bijections A072796/A072797 partition each A000108(n) structures encoded in the range [A014137(n-1)..A014138(n-1)] of the sequence A014486/A063171.

%F a(n) = (A000108(n)+A073190(n))/2.

%Y Occurs for first time in A073201 as row 1.

%K nonn

%O 0,3

%A _Antti Karttunen_, Jun 25 2002