cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A081151 Number of even cycles in range [A014137(2n-1)..A014138(2n-1)] of permutation A057505/A057506.

Original entry on oeis.org

0, 1, 3, 18, 95, 528, 2936, 16212, 90717, 516358, 2979992
Offset: 0

Views

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Keywords

Comments

Equal to the number of all cycles in the same range (after n>0).

Crossrefs

Cf. A081152.
Cf. A081150, A081158, A001700, A057507.
Cf. A014137, A014138, A057505, A057506.

Formula

a(n) = A081150(2n) = A081158(n)+A001700(n-1) [where A001700(-1) is taken as 0 here] = A057507(2n) [After n>0].

A081157 Number of even cycles in range [A014137(n-1)..A014138(n-1)] of permutation A057505/A057506, with no fixed points of either A057163 or A057164.

Original entry on oeis.org

0, 0, 0, 0, 0, 2, 8, 20, 60, 148, 402, 986, 2474, 5918, 14496, 34708, 84282, 202664, 492048
Offset: 0

Views

Author

Wouter Meeussen and Antti Karttunen, Mar 10 2003

Keywords

Crossrefs

Cf. A014137, A014138, A057505, A057506, A057163, A057164
Bisections: A081158, A081159. Cf. A081150, A081160, A081162.
Showing 1-2 of 2 results.

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