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A081158
Number of even cycles in range [A014137(2n-1)..A014138(2n-1)] of permutation A057505/A057506, with no fixed points of A057164.
2
0, 0, 0, 8, 60, 402, 2474, 14496, 84282, 492048
OFFSET
0,4
FORMULA
a(n) = A081157(2n) = A081151(n) - A001700(n-1) [where A001700(-1) is taken as 0 here].
KEYWORD
nonn,more
AUTHOR
STATUS
approved