131676domain: NAppears in sequencesDirichlet convolution of d(n) (# of divisors) with b_n=2^(n-1).at n=17A034771Number of twice-crossing partitions on n nodes.at n=11A287221G.f. A(x) satisfies A(x) = 1 + x * ((1 - x) / A(x))^(3/2).at n=9A366433Centered pentagonal numbers that are abundant.at n=41A382696