61883839

Appears in sequences

• a(0) = -1; a(1) = 0; a(2) = 1; a(3) = -1; a(n) = a(n-1) - 3*a(n-2) + 3*a(n-3) - a(n-4).at n=37A141577
• G.f. satisfies A(x) = 1 + x*A(x) / (1 + x)^4.at n=27A365083