40546

Appears in sequences

• a(n) = 4*a(n-1) - a(n-2) - 2, with a(0)=1, a(1)=2.at n=9A072110
• G.f. satisfies: x = A(x) - A(A(x))^2 - A(A(A(x)))^3.at n=6A177395
• Indices of primes in A000712.at n=27A285217
• Array read by antidiagonals: T(n,k) is the number of unlabeled oriented k-gonal 2-trees with n oriented polygons, n >= 0, k >= 2.at n=74A340812
• a(n) = coefficient of x^n, n >= 0, in A(x) such that: 1 = Sum_{n=-oo..+oo} x^n * (2*A(x) - x^n)^(n-1).at n=7A357227