-1557domain: ZAppears in sequencesa(n) = a(n-1) - 2*a(n-2) - 3*a(n-3) - ... - (n-1)*a(1), a(1) = a(2) = 3, a(3) = -3.at n=10A106542Triangle, row sums = A008683, the Mobius sequence.at n=53A124840Expansion of f(-x) * f(-x^2)^4 / phi(x^2) in powers of x where phi(), f() are Ramanujan theta functions.at n=30A275372