Number of permutations of order n with the length of longest run equal to 4.
A001252
Number of permutations of order n with the length of longest run equal to 4.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =2a(4) =16a(5) =134a(6) =1164a(7) =10982a(8) =112354a(9) =1245676a(10) =14909340a(11) =191916532a(12) =2646100822a(13) =38932850396a(14) =609137502242
External references
- oeis: A001252