-1431

Appears in sequences

• a(n) = -(1/2)*(n+2)*(n^2 - 6*n - 1).at n=16A028494
• Expansion of (1-x)^(-1)/(1-x^2+x^3).at n=31A077883
• Sequence is {a(3,n)}, where a(m,n) is defined at sequence A110665.at n=53A110668
• a(n) = mu(n) * A000217(n).at n=52A125287
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 475", based on the 5-celled von Neumann neighborhood.at n=29A272450
• Triangle read by rows, defined by Riordan's general Eulerian recursion: T(n, k) = (k+3)*T(n-1, k) + (n-k-2) * T(n-1, k-1) with T(n,1) = 1, T(n,n) = (-2)^(n-1).at n=30A306547
• a(1) = 1; a(n) = -(1/2) * Sum_{d|n, d > 1} d * (d + 1) * a(n/d).at n=52A334879
• Product_{n>=1} 1 / (1 - a(n)*x^n) = 1 + Sum_{n>=1} sigma(n)*x^n, where sigma = A000203.at n=27A353947
• Expansion of 1 / Sum_{k>=0} x^(k*(3*k - 2)).at n=47A363275
• Expansion of e.g.f. (2 - exp(x))^3.at n=7A377398