A081148 Number of odd cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506.

1, 1, 0, 1, 0, 4, 0, 9, 0, 24, 0, 62, 0, 162, 0, 447, 0, 1234, 0

Offset

0,6

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) = A081153(n) + A081155(n) = A057507(n) - A081150(n).

Crossrefs

Bisection: A081149.

Cf. A081153, A081155, A057507, A081150.

Cf. A014137, A014138, A057505, A057506.

Sequence in context: A291716 A022899 A364101 * A306954 A187606 A138478

Adjacent sequences: A081145 A081146 A081147 * A081149 A081150 A081151

Keyword

nonn,more

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Status

approved