559083domain: NAppears in sequencesa(n) = 1123 + 21460*n.at n=26A069984G.f. satisfies: A(A(x)) = Sum_{n>=1} a(n)*x^n / (1-x)^(n*(n+1)/2), where g.f. A(x) = Sum_{n>=1} a(n)*x^n.at n=7A193195