Kurepa determinant K_n.

Terms

a(0) =15a(1) =-47a(2) =197a(3) =-1029a(4) =6439a(5) =-46927a(6) =390249a(7) =-3645737a(8) =37792331a(9) =-430400211a(10) =5341017373a(11) =-71724018781