32354

Appears in sequences

• Triangle read by rows: T(n,k) is the number of indecomposable (connected) permutations of {1,2,...,n} having genus k (see first comment for definition of genus).at n=37A185209
• Product_{n>=1} (1 + a(n)*x^n) = 1 + x + x^2 + 2 * Sum_{n>=3} a(n)*x^n.at n=16A348756
• Numbers k such that A003415(k) >= A276086(k) and gcd(k, A003415(k)) = gcd(k, A276086(k)), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function.at n=45A369959