699040

Appears in sequences

• Expansion of 1/((1-x)*(1-2*x)*(1-x^2)).at n=18A011377
• Number of subsets of {1,2,..n} that sum to 1 mod n.at n=23A064355
• Numbers k such that phi(k) is a perfect 9th power.at n=23A078169
• Generalized Jacobsthal numbers.at n=20A083579
• a(n) = 2*(4^n - 1)/3 - n.at n=9A144414
• Terms of A181666 of the form 3*k+1.at n=39A172126
• Partial sums of floor(2^n/3).at n=19A178420