A242836 Number of compositions of n with difference -5 between the number of odd parts and the number of even parts, both counted without multiplicity.

120, 0, 480, 0, 1800, 0, 5580, 0, 16224, 0, 43884, 0, 111828, 5040, 295752, 90720, 918144, 836640, 3717552, 5937840, 18033888, 36198000, 92552004, 199157040, 468066444, 1018608720, 2283162630, 4928557200, 10715965290, 22825049040, 48562957800, 102021279960

Offset

30,1

Comments

First odd term is a(114) = 348277353263626685406276711.

Links

Alois P. Heinz, Table of n, a(n) for n = 30..500

Example

a(30) = 120 = 5!: all permutations of {2,4,6,8,10}.

Crossrefs

Column k=-5 of A242626.

Sequence in context: A357968 A156415 A073836 * A229031 A221406 A267428

Adjacent sequences: A242833 A242834 A242835 * A242837 A242838 A242839

Keyword

nonn

Author

Alois P. Heinz, May 23 2014

Status

approved