A242843 Number of compositions of n with difference 3 between the number of odd parts and the number of even parts, both counted without multiplicity.

6, 12, 26, 54, 104, 194, 357, 590, 1012, 1814, 3137, 5990, 11400, 22864, 46715, 97788, 206639, 438654, 930092, 1969748, 4147412, 8696479, 18137872, 37638970, 77738200, 159832004, 327315948, 667736364, 1357690562, 2751972885, 5562836882, 11216402410

Offset

9,1

Links

Alois P. Heinz, Table of n, a(n) for n = 9..500

Example

a(9) = 6 = 3!: all permutations of {1,3,5}.

Crossrefs

Column k=3 of A242626.

Sequence in context: A283221 A177282 A283139 * A232935 A200079 A352091

Adjacent sequences: A242840 A242841 A242842 * A242844 A242845 A242846

Keyword

nonn

Author

Alois P. Heinz, May 23 2014

Status

approved