A255942 Number of collections of nonempty multisets with a total of n objects of exactly two colors.

2, 8, 23, 56, 127, 268, 547, 1072, 2055, 3836, 7045, 12692, 22566, 39542, 68520, 117354, 199082, 334446, 557175, 920528, 1509606, 2457698, 3974813, 6387026, 10201990, 16201424, 25589505, 40205766, 62857564, 97800674, 151475564, 233575222, 358656011, 548476318

Offset

2,1

Links

Vaclav Kotesovec, Table of n, a(n) for n = 2..10000 (terms 2..1000 from Alois P. Heinz)

Formula

a(n) = A255903(n,2).

Crossrefs

Column k=2 of A255903.

Sequence in context: A330152 A079460 A154144 * A355551 A180664 A294959

Adjacent sequences: A255939 A255940 A255941 * A255943 A255944 A255945

Keyword

nonn

Author

Alois P. Heinz, Mar 11 2015

Status

approved