-1207

Appears in sequences

• Row sums of triangle A132898.at n=33A132899
• a(n) = n^2 - (n-1)^2 - (n-2)^2 - ... - 1^2.at n=16A179297
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 193", based on the 5-celled von Neumann neighborhood.at n=25A270688
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 253", based on the 5-celled von Neumann neighborhood.at n=17A271053
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 259", based on the 5-celled von Neumann neighborhood.at n=17A271057
• Let f(x) = 1 -x^3+ Sum_{j>=2} (x^(2^j)-x^(1+2^j)). Then a(n) is n times the coefficient of x^n in the expansion of log(f(x)).at n=33A271726
• Expansion of Product_{i>=1, j>=1, k>=1} (1 - x^(i*j*k)).at n=34A319359