133575

Appears in sequences

• C(2*n+4,4)-C(2*n,4).at n=29A085474
• a(n) = a(n-1) - 2*a(n-2) - 3*a(n-3) - ... - (n-1)*a(1), with a(1) = a(2) = 1, a(3) = -1.at n=20A106540