-1676

Appears in sequences

• Image of Euler totient function (A000010) under "little Hankel" transform that sends [c_0, c_1, ...] to [d_0, d_1, ...] where d_n = c_n^2 - c_{n+1}*c_{n-1}.at n=46A056228
• Convolution of A073145 with A056594.at n=22A075419
• McKay-Thompson series of class 18i for the Monster group.at n=43A112157
• Inverse Euler transform of A118052.at n=56A118054
• Coefficients of the eighth-order mock theta function T_1(q).at n=47A153156
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 35", based on the 5-celled von Neumann neighborhood.at n=23A269817
• a(n) = Sum_{k=1..n} (-1)^k*k^2*floor(n/k).at n=46A366915