855225

Appears in sequences

• Let M[n] be the 2 X 2 matrix {{0, -3}, {(n - 1), 5*(n - 1)}} and let v[1] = {0, 1}', v[n] = M[n]*v[n - 1]'. Then a[n] is the first entry of v[n].at n=6A108210
• Expansion of e.g.f. (1/(1 - x)) * Product_{k>=2} 1/(1 - x^k)^(phi(k)/2), where phi() is the Euler totient function (A000010).at n=8A308457