a(n) = Sum_{j=0..n} (-1)^(n-j) * Product_{k=(j-1)*n+1..j*n} k.
A349480
a(n) = Sum_{j=0..n} (-1)^(n-j) * Product_{k=(j-1)*n+1..j*n} k.
Terms
- a(0) =1a(1) =1a(2) =10a(3) =390a(4) =33456a(5) =4845360a(6) =1059099840a(7) =325460948400
External references
- oeis: A349480