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A081163
Number of even cycles in range [A014137(2n)..A014138(2n)] of permutation A057505/A057506, with two fixed-points of A057163.
3
0, 0, 0, 1, 4, 15, 56, 185, 655
OFFSET
0,5
FORMULA
a(n) = A081162(2n+1) = (A000108(n) - A081156(n))/2.
KEYWORD
nonn,more
AUTHOR
STATUS
approved