login
Number of ways to partition a 2-colored labeled set into identical subsets.
0

%I #6 Jan 08 2019 09:12:41

%S 2,6,10,30,34,226,130,2078,2754,31770,2050,963826,8194,17320530,

%T 45886578,561051678,131074,29864241434,524290,759743216906,

%U 4635692722434,28158593662770,8388610,3930830007646194,166229565054466

%N Number of ways to partition a 2-colored labeled set into identical subsets.

%F sum {d|n} ((2^d*n!)/(d!*((n/d)!)^d)).

%K nonn

%O 1,1

%A _Christian G. Bower_

%E More terms from _Michel ten Voorde_ Apr 13 2001