71223

Appears in sequences

• Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7.at n=13A238918
• Numbers k such that 3*R_k + 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=17A256463
• E.g.f. A(x) satisfies: Product_{n>=1} (1 - (-A(x))^n) = exp(x).at n=5A294330