A081150 Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506.

0, 0, 1, 1, 3, 6, 18, 37, 95, 212, 528, 1226, 2936, 6822, 16212, 38081, 90717, 215414, 516358

Offset

0,5

Comments

For the convenience of the range notation above, we define A014137(-1) and A014138(-1) as zero.

Links

Table of n, a(n) for n=0..18.

Antti Karttunen, Counted with the help of this C program.

Formula

a(n) = A081157(n) + A081160(n) + A081162(n) = A057507(n) - A081148(n).

Crossrefs

Bisections: A081151, A081152.

Cf. A081157, A081160, A081162, A057507, A081148.

Cf. A014137, A014138, A057505, A057506.

Sequence in context: A268529 A026532 A160505 * A362014 A216813 A356766

Adjacent sequences: A081147 A081148 A081149 * A081151 A081152 A081153

Keyword

nonn,more

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Status

approved