76285domain: NAppears in sequencesa(n) = (2*n - 1)*(11*n^2 - 11*n + 6)/6.at n=27A063492Number of zero-sum -2..2 arrays of n elements with first and second differences also in -2..2.at n=11A201867G.f. A(x) satisfies: A(x) = x + x^2 * exp(A(x) + A(-x^2)/2 + A(x^3)/3 + A(-x^4)/4 + ...).at n=22A345235