a(n) = (-1)^n*permanent[tan(Pi*(j+k)/(2n+1))]_{1<=j,k<=2n}.
A346162
a(n) = (-1)^n*permanent[tan(Pi*(j+k)/(2n+1))]_{1<=j,k<=2n}.
Terms
- a(0) =3a(1) =65a(2) =1995a(3) =149121a(4) =13399155a(5) =2141638785a(6) =387394882875
External references
- oeis: A346162