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A242838
Number of compositions of n with difference -3 between the number of odd parts and the number of even parts, both counted without multiplicity.
2
6, 0, 18, 0, 56, 0, 146, 0, 312, 120, 1037, 1440, 4658, 9624, 23906, 52524, 117032, 255732, 542186, 1150920, 2370395, 4902948, 9912558, 20084700, 40045005, 79902108, 157676536, 310969848, 608833717, 1190681692, 2317419418, 4505327884, 8732462296, 16911676140
OFFSET
12,1
LINKS
EXAMPLE
a(12) = 6 = 3!: all permutations of {2,4,6}.
CROSSREFS
Column k=-3 of A242626.
Sequence in context: A308236 A019134 A167298 * A304878 A167356 A219540
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 23 2014
STATUS
approved