96180

Appears in sequences

• Number of series-reduced planted trees with n leaves of 2 colors.at n=8A050381
• At these values of k, the 1st, 2nd, 3rd and 4th cyclotomic polynomials all give prime numbers.at n=11A070025
• Numbers k such that k-1, k+1, k^2+1 and k^4+1 are all prime numbers.at n=9A070156
• Number of ways to place 2 nonattacking wazirs on an n X n board.at n=20A172225
• a(n) = (4/(2*n-3))*(2*(n-1)*(2*n-1)*a(n-1) + (-1)^n*Product_{k=0..n-1} (2*k+1)) with a(0) = 0.at n=4A302113
• Array read by antidiagonals: T(n,k) is the number of series-reduced rooted trees with n leaves of k colors.at n=53A319254