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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 (list; graph; refs; listen; history; text; internal format)
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: A075406 A075404 A308234 * A194894 A128379 A111983

Adjacent sequences:  A242834 A242835 A242836 * A242838 A242839 A242840

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 23 2014

STATUS

approved

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Last modified March 30 12:10 EDT 2020. Contains 333125 sequences. (Running on oeis4.)