a(n) = n! * Sum_{k=0..floor(n/4)} (-k)^k / (k! * (n-4*k)!).

A362339

a(n) = n! * Sum_{k=0..floor(n/4)} (-k)^k / (k! * (n-4*k)!).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-23a(5) =-119a(6) =-359a(7) =-839a(8) =78961a(9) =722737a(10) =3623761a(11) =13297681a(12) =-2115602279a(13) =-27917827079a(14) =-195909017303a(15) =-980236890359

External references