2782584

Appears in sequences

• Number of partitions of {1,..,n} into lists with an even number of lists of size 1, where a list means an ordered subset (cf. A000262).at n=9A111752
• E.g.f. A(x) satisfies A(x) = 1 + x^3*exp(x)*A(x)^2.at n=9A390648