61846

Appears in sequences

• Number of ways to arrange 3 nonattacking knights on the lower triangle of an n X n board.at n=11A194487
• Triangle read by rows: Coefficients of the polynomials S2(n, x) * EZ(n, x), where S2 denote the Stirling set polynomials and EZ the Eulerian zig-zag polynomials A205497.at n=45A373428
• a(n) is the number of primes q <= A080082(n) such that prime(n) divides q + 1.at n=25A390840