531811

Appears in sequences

• a(n) = n*(a(n-1)*2+1), a(0) = 0.at n=7A067273
• G.f. A(x) satisfies A(x) = 1 / (1 - x - x * (1 + x + x^2 + x^3 + x^4) * A(x^5)).at n=14A367658