A242837 Number of compositions of n with difference -4 between the number of odd parts and the number of even parts, both counted without multiplicity.

24, 0, 84, 0, 288, 0, 822, 0, 2226, 0, 5304, 720, 15034, 10680, 55624, 84360, 265200, 527640, 1342608, 2886960, 6673176, 14433240, 31725930, 67718568, 144265370, 302771208, 631156708, 1303769496, 2673673704, 5447789784, 11028089996, 22211684328, 44491303391

Offset

20,1

Comments

First odd term is a(52) = 44491303391.

Links

Alois P. Heinz, Table of n, a(n) for n = 20..500

Example

a(20) = 24 = 4!: all permutations of {2,4,6,8}.

Crossrefs

Column k=-4 of A242626.

Sequence in context: A356304 A308234 A362795 * A353324 A194894 A364226

Adjacent sequences: A242834 A242835 A242836 * A242838 A242839 A242840

Keyword

nonn

Author

Alois P. Heinz, May 23 2014

Status

approved