306075domain: NAppears in sequencesa(n) = coefficient of x^n in Sum_{n>=0} x^n/(1 - x*C(x)^n), where C(x) = 1/(1 - x*C(x)) is a g.f. of the Catalan numbers (A000108).at n=12A357220a(n) is the least positive integer that can be expressed as the sum of one or more consecutive nonprime numbers in exactly n ways.at n=17A361473