a(n) is the permanent of the n X n matrix A(n) that is defined as A[i,j,n] = n - abs((n + 1)/2 - i) - abs((n + 1)/2 - j).

A349107

a(n) is the permanent of the n X n matrix A(n) that is defined as A[i,j,n] = n - abs((n + 1)/2 - i) - abs((n + 1)/2 - j).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =22a(4) =292a(5) =9084a(6) =314736a(7) =19224816a(8) =1267665984a(9) =127896194880

External references