14097919968domain: NAppears in sequencesCoordination sequence for A_11 lattice.at n=12A035837Number of integer sequences of length n+1 with sum zero and sum of absolute values 24.at n=10A157061a(0) = 0, a(n) = [x^n] P(n-1,(1 + x)/(1 - x)) for n >= 1, where P(n,x) denotes the n-th Legendre polynomial.at n=12A352654