Number of permutations sigma of [n] such that i divides Product_{k=1..i} sigma(k) for 1 <= i <= n.
A333892
Number of permutations sigma of [n] such that i divides Product_{k=1..i} sigma(k) for 1 <= i <= n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =36a(6) =320a(7) =1328a(8) =7872a(9) =51552a(10) =756480a(11) =5440752a(12) =68999136a(13) =584117952a(14) =9632932800a(15) =152699071104
External references
- oeis: A333892