-1847

Appears in sequences

• Expansion of (1-5*x-x^2+x^3)/((1+x)*(1-x)^3).at n=42A141354
• a(n)=1-4*n-4*n^2.at n=21A184882
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation of 1 + x + x^2 + ... + x^n to the polynomial A_k*(x+(-1)^k)^k for 0 <= k <= n.at n=22A248975
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 342", based on the 5-celled von Neumann neighborhood.at n=43A269512
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 261", based on the 5-celled von Neumann neighborhood.at n=21A271064
• Start with 2, then successively subtract the primes 3, 5, 7, ...at n=31A282329
• Expansion of Product_{k>=1} 1/(1 + x^k)^(k*(3*k-1)/2).at n=11A295086
• Numerators of the partial alternating sums of the reciprocals of the unitary totient function (A047994).at n=19A379519