122316

Appears in sequences

• Expansion of 1/((1-x)*(1-2*x)*(1-5*x)*(1-8*x)).at n=5A021129
• Numbers k such that (k+1)*phi(k) is a perfect square.at n=35A069952
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 0), (1, 1, 0)}.at n=9A150364
• G.f. A(x) satisfies: [x^n] A(x)^((n+1)^2) = 0 for n>1 with a(0)=a(1)=1.at n=7A171791
• Number of subsets of {1,2,...,n} with the sum of reciprocals <= 1.at n=20A212657