Numerator of Laguerre(n, -1).

Terms

a(0) =1a(1) =2a(2) =7a(3) =17a(4) =209a(5) =773a(6) =13327a(7) =65461a(8) =1441729a(9) =1255151a(10) =234662231a(11) =1702678841a(12) =53334454417a(13) =448162154317