a(n) = n! * Sum_{k=1..n} k^2/floor(n/k).
A342933
a(n) = n! * Sum_{k=1..n} k^2/floor(n/k).
Terms
- a(0) =1a(1) =9a(2) =80a(3) =654a(4) =6264a(5) =59760a(6) =665160a(7) =7565040a(8) =96929280a(9) =1286046720a(10) =18976083840a(11) =286363123200
External references
- oeis: A342933