35581680domain: NAppears in sequencesFifth column of triangle A103371 (without leading zeros).at n=14A134287a(n) = C(n, Q(n+3, 4)-1)*C(n, Q(n+1, 4)) + C(n, Q(3*n+1, 4))*C(n, Q(3*n+3, 4)) where C = binomial and Q(x, y) = floor(x/y).at n=18A380121