128745

Appears in sequences

• G.f.: exp(Sum_{k>=1} B(x^k)/k), where B(x) = x + 2*x^2 + 5*x^3 + 14*x^4 + 42*x^5 + ... = (C(x)-1)/x and C is the g.f. for the Catalan numbers A000108.at n=11A088327
• Numbers k such that 2^k + 3*k is prime.at n=24A093988
• Number of nonnegative integer arrays of length n+2 with new values 0 upwards introduced in order, and containing the value n-1.at n=30A211562