a(n) = n! * Sum_{k=0..floor(n/4)} (-1)^k / (n-4*k)!.
A337751
a(n) = n! * Sum_{k=0..floor(n/4)} (-1)^k / (n-4*k)!.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-23a(5) =-119a(6) =-359a(7) =-839a(8) =38641a(9) =359857a(10) =1809361a(11) =6644881a(12) =-459055079a(13) =-6175146119a(14) =-43468088663a(15) =-217686301559
External references
- oeis: A337751