A242837 - OEIS

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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.

2

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

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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