Number of permutations of order n with the length of longest run equal to 3.
A001251
Number of permutations of order n with the length of longest run equal to 3.
Terms
- a(0) =0a(1) =0a(2) =2a(3) =12a(4) =70a(5) =442a(6) =3108a(7) =24216a(8) =208586a(9) =1972904a(10) =20373338a(11) =228346522a(12) =2763212980a(13) =35926266244a(14) =499676669254
External references
- oeis: A001251