-1219

Appears in sequences

• Expansion of (1-x)^(-1)/(1+2*x+2*x^3).at n=9A077927
• Sum at 45 degrees to horizontal in triangle of A081498.at n=45A081499
• First column in inverse of Euler phi sequence matrix.at n=30A106479
• Numerator of f(A159992(n)/A159993(n)) with f(x)=x^3+2*x^2+10*x-20, denominator=A159995.at n=1A159994
• Triangle read by rows, expansion of 1/(1-2*y*x-x+x^2-y*x^2).at n=49A164976
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 1", based on the 5-celled von Neumann neighborhood.at n=17A269909
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 413", based on the 5-celled von Neumann neighborhood.at n=17A272010
• Expansion of Product_{k>0} (1+sqrt(1-4*x^k))/2.at n=9A309867