Number of permutations p of [n] such that in 0p the largest up-jump equals four and no down-jump is larger than 2.
A321111
Number of permutations p of [n] such that in 0p the largest up-jump equals four and no down-jump is larger than 2.
Terms
- a(0) =4a(1) =20a(2) =108a(3) =586a(4) =3098a(5) =16230a(6) =85150a(7) =446972a(8) =2349616a(9) =12376800a(10) =65353448a(11) =345933358a(12) =1835637246a(13) =9764363438a(14) =52064375292a(15) =278256581910
External references
- oeis: A321111