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
Keywords
Links
- Vaclav Kotesovec, Table of n, a(n) for n = 2..10000 (terms 2..1000 from Alois P. Heinz)
Crossrefs
Column k=2 of A255903.
Formula
a(n) = A255903(n,2).