Leading diagonal of triangle in A259689: a(n)= number of permutations without overlaps that generate exactly 2 permutations without overlaps in a(n+1).
A260785
Leading diagonal of triangle in A259689: a(n)= number of permutations without overlaps that generate exactly 2 permutations without overlaps in a(n+1).
Terms
- a(0) =1a(1) =2a(2) =2a(3) =6a(4) =10a(5) =32a(6) =68a(7) =220a(8) =528a(9) =1724a(10) =4460a(11) =14664a(12) =39908a(13) =131944a(14) =372448a(15) =1237016a(16) =3589384a(17) =11967140a(18) =35479312a(19) =118675768a(20) =357957984a(21) =1200724776a(22) =3673173656a(23) =12351611656a(24) =38232022416
External references
- oeis: A260785