Number of permutations of [n] with two ordered cycles such that equal-sized cycles are ordered with increasing least elements.
A285853
Number of permutations of [n] with two ordered cycles such that equal-sized cycles are ordered with increasing least elements.
Terms
- a(0) =1a(1) =6a(2) =19a(3) =100a(4) =508a(5) =3528a(6) =24876a(7) =219168a(8) =1980576a(9) =21257280a(10) =234434880a(11) =2972885760a(12) =38715943680a(13) =566931294720
External references
- oeis: A285853