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A081151
Number of even cycles in range [A014137(2n-1)..A014138(2n-1)] of permutation A057505/A057506.
5
0, 1, 3, 18, 95, 528, 2936, 16212, 90717, 516358, 2979992
OFFSET
0,3
COMMENTS
Equal to the number of all cycles in the same range (after n>0).
FORMULA
a(n) = A081150(2n) = A081158(n)+A001700(n-1) [where A001700(-1) is taken as 0 here] = A057507(2n) [After n>0].
CROSSREFS
KEYWORD
nonn,more
AUTHOR
STATUS
approved