154944

Appears in sequences

• Constant term in the reduction by (x^2 -> x + 1) of the polynomial C(n)*x^n, where C=A000285.at n=13A192914
• T(n, k) = Sum_{j=0..k} binomial(n, k - j)*Stirling1(n - k + j, j)*(-1)^(n-k). Triangle read by rows, T(n, k) for 0 <= k <= n.at n=47A341101
• Value of T[4] after the n-th iteration, when the map T is initialized with T[1] = 1 and in subsequent iterations, T[v] = k + (T[v] if defined else 0) for all key-value pairs (k, v) in T; a(n) = 0 if T[4] isn't defined yet.at n=21A390944