Numerator of Laguerre(n, -2).

Terms

a(0) =1a(1) =3a(2) =7a(3) =43a(4) =27a(5) =719a(6) =3661a(7) =13991a(8) =66769a(9) =133261a(10) =2363513a(11) =116441047a(12) =513267739a(13) =153434147a(14) =96790969339a(16) =136839921293