A190389 Number of permutations of 0..(n-1) with equal numbers of bit changes for every bit in the binary representation of the permutation.

1, 2, 2, 0, 0, 36, 144, 672, 0, 688, 161420, 1568320, 16640624, 234147048, 2955532608, 39844932096

Offset

1,2

Links

Table of n, a(n) for n=1..16.

Example

Some solutions for n=6 (in binary)
..100.101.011.100.010.010.011.010.011.011.010.100.011.010.100.101
..010.011.101.010.000.000.000.001.000.001.100.001.101.001.010.011
..101.000.010.001.001.011.001.000.101.010.011.010.010.100.001.100
..000.100.001.101.100.100.101.100.001.101.001.000.000.000.000.000
..001.001.000.000.011.001.010.011.010.000.000.101.001.011.101.001
..011.010.100.011.101.101.100.101.100.100.101.011.100.101.011.010

Crossrefs

Sequence in context: A282441 A281988 A394577 * A285485 A176127 A391511

Adjacent sequences: A190386 A190387 A190388 * A190390 A190391 A190392

Keyword

nonn

Author

R. H. Hardin, May 09 2011

Status

approved