248245domain: NAppears in sequencesNumber of nondecreasing integer sequences of length 11 with sum zero and sum of absolute values 2n.at n=22A158145a(n) = coefficient of x^n in the power series A(x) such that: 1 = Sum_{n=-oo..+oo} n*(n+1)*(n+2)*(n+3)/4! * x^n * (1 - x^(n+3))^n * A(x)^(n+3).at n=5A357796