-1849

Appears in sequences

• Expansion of g.f. -(1+27*x^2)/((1+3*x)*(1-2*x+9*x^2)).at n=6A106632
• a(n) = -n^2 + 9*n + 23.at n=48A126719
• Convolution of A006352 and A010815.at n=77A143278
• Let c(n) = x^(2^n-1)*(1-x^(2^n)), g(n) = 1 + x^(2^n-1) + x^(2^n), h(n) = Product_{i=1..n} g(i); then use g.f. Sum_{n>=1} c(n)/h(n).at n=54A151676
• Abundances of A188484(n).at n=10A188487
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 5", based on the 5-celled von Neumann neighborhood.at n=21A270009
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 7", based on the 5-celled von Neumann neighborhood.at n=21A270013
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 73", based on the 5-celled von Neumann neighborhood.at n=21A270090
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 89", based on the 5-celled von Neumann neighborhood.at n=21A270132
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Product_{j=1..n} (1-x^j) - 1).at n=52A294254
• E.g.f.: exp((1-x)*(1-x^2) - 1).at n=7A294255
• Dirichlet g.f.: 1 / zeta(s-2).at n=42A334657
• a(1) = 1, a(2) = -5; a(n) = -n^2 * Sum_{d|n, d < n} a(d) / d^2.at n=42A359485
• a(1) = 1, a(2) = 3; a(n) = n^2 * Sum_{d|n, d < n} (-1)^(n/d) a(d) / d^2.at n=42A361986
• a(1) = 1; a(n) = n^2 * Sum_{d|n, d < n} (-1)^(n/d) a(d) / d^2.at n=42A361987
• Triangle read by rows, based on products of Jacobsthal numbers (A001045).at n=26A378931