403199

Appears in sequences

• Positions of non-crossing fixed-point-free involutions encoded by A014486 (after reflection) in A055089. Permutation of A064640.at n=36A064639
• Positions of non-crossing fixed-point-free involutions (encoded by A014486) in A055089, sorted to ascending order.at n=36A064640
• Triangle read by rows: (A000012 * A136572 + A136572 * A000012) - A000012.at n=53A136573
• a(n) = (n! - 9)/9.at n=4A139184
• a(n) = (n!)^2 * Sum_{d|n} (-1)^(d+1) / (d!)^2.at n=5A336242