-1541

Appears in sequences

• a(n) = -a(n-1) - 2*a(n-2).at n=22A001607
• Coefficients of period polynomials.at n=17A006309
• Lower triangular matrix T, read by rows, such that the row sums of T^n form the n-dimensional partitions.at n=114A096651
• a(n) = (-1)^(n-3)*binomial(n,3) - 1.at n=19A216414
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 237", based on the 5-celled von Neumann neighborhood.at n=23A270983