Incomplete Gamma Function at -3.

Terms

a(0) =1a(1) =-2a(2) =5a(3) =-12a(4) =33a(5) =-78a(6) =261a(7) =-360a(8) =3681a(9) =13446a(10) =193509a(11) =1951452a(12) =23948865a(13) =309740922a(14) =4341155877a(15) =65102989248