a(k) = k! * lim_{n->oo} card({ i*j; i=1..k, j=1..n })/n.
A126959
a(k) = k! * lim_{n->oo} card({ i*j; i=1..k, j=1..n })/n.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =58a(4) =352a(5) =2376a(6) =19296a(7) =168912a(8) =1670976a(9) =18000000a(10) =219916800a(11) =2781561600a(12) =39605760000a(13) =584889984000
External references
- oeis: A126959