75504

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 0,0,1,1.at n=28A025277
• Numbers k such that (7*3^k - 5)/2 is prime.at n=23A059569
• Square array T(n,k) read by antidiagonals: T(n,k) = Product_{1<=i<=j<=k} (n+i+j-1)/(i+j-1).at n=48A102539
• Triangle read by rows, related to A108283.at n=38A108284
• a(n) = (1/(1!*2!*3!*4!))*Sum_{1 <= x_1, x_2, x_3, x_4 <= n} |det V(x_1,x_2,x_3,x_4)|, where V(x_1,x_2,x_3,x_4) is the Vandermonde matrix of order 4.at n=10A133111
• Number of ordered trees with n edges such that non-leaf vertices at even levels have outdegree 1 and those at odd levels have outdegree 2.at n=26A248100
• a(n) = A259708(n,n-1).at n=12A259709
• a(n) = (n+1)*(3*n-2)*C(2*n,n-1)/(4*n-2).at n=7A352626