Number of involutions of length 2n+1 which are invariant under the reverse-complement map and have no decreasing subsequences of length 7.
A145868
Number of involutions of length 2n+1 which are invariant under the reverse-complement map and have no decreasing subsequences of length 7.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =68a(5) =255a(6) =1020a(7) =4221a(8) =18186a(9) =80304a(10) =364476a(11) =1684782a(12) =7944156a(13) =37988379a(14) =184406508a(15) =905147815a(16) =4495346570a(17) =22527055980a(18) =113957354940a(19) =580759868910
External references
- oeis: A145868