a(n) = -n! * Sum_{d|n} (-n/d)^d / d!.

Terms

a(0) =1a(1) =3a(2) =19a(3) =47a(4) =601a(5) =2039a(6) =35281a(7) =-26881a(8) =4898881a(9) =-8104321a(10) =439084801a(11) =576132479a(12) =80951270401a(13) =-913158005761