144977296932domain: NAppears in sequencesCoordination sequence for A_12 lattice.at n=13A035838Number of integer sequences of length n+1 with sum zero and sum of absolute values 26.at n=11A157062a(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=13A352654