a(n) = n! * Sum_{k=0..floor(n/3)} (-k)^k / (k! * (n-3*k)!).
A362338
a(n) = n! * Sum_{k=0..floor(n/3)} (-k)^k / (k! * (n-3*k)!).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =-5a(4) =-23a(5) =-59a(6) =1321a(7) =9871a(8) =39985a(9) =-1512503a(10) =-16027919a(11) =-89148509a(12) =4751428441a(13) =65256458125a(14) =461686022617
External references
- oeis: A362338