A209863 a(n) = Number of fixed points of permutation A209861/A209862 in range [2^(n-1),(2^n)-1].

1, 1, 2, 4, 6, 6, 6, 8, 8, 8, 12, 8, 10, 8, 10, 6, 6, 10, 8, 6, 6, 10, 8, 8, 6

Offset

0,3

Comments

See the conjecture given in A209860. If true, then all the terms from a(2) onward are even. a(0) gives the number of fixed points in range [0,0], i.e. 1.

Links

Antti Karttunen, Table of n, a(n) for n = 0..24

Crossrefs

A209860, A209864, A209865, A209866, A209867.

Sequence in context: A225369 A296511 A050823 * A207540 A050825 A174342

Adjacent sequences: A209860 A209861 A209862 * A209864 A209865 A209866

Keyword

nonn

Author

Antti Karttunen, Mar 24 2012

Status

approved