Number of permutations p of [n] such that p(i) > p(i+1) iff i == 1 (mod 6).
A250262
Number of permutations p of [n] such that p(i) > p(i+1) iff i == 1 (mod 6).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =5a(7) =6a(8) =41a(9) =208a(10) =711a(11) =1970a(12) =4741a(13) =10284a(14) =123397a(15) =1041224a(16) =5690415a(17) =24359248a(18) =87922385a(19) =278723178a(20) =4777712981a(21) =56439873880a(22) =424119250083
External references
- oeis: A250262