a(n) = n! * Sum_{k=1..n} Sum_{d|k} d/(k/d)!.
A356459
a(n) = n! * Sum_{k=1..n} Sum_{d|k} d/(k/d)!.
Terms
- a(0) =1a(1) =7a(2) =40a(3) =281a(4) =2006a(5) =17677a(6) =159020a(7) =1678721a(8) =18555850a(9) =230978981a(10) =2979853592a(11) =43323807265a(12) =644160764846
External references
- oeis: A356459