Number of Dumont permutations of the fourth kind of length 2n avoiding the pattern 312.
A343795
Number of Dumont permutations of the fourth kind of length 2n avoiding the pattern 312.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =39a(5) =174a(6) =872a(7) =4805a(8) =28474a(9) =178099a(10) =1160173a(11) =7803860a(12) =53924841a(13) =381640934a(14) =2761331130a(15) =20400560942a(16) =153738854242
External references
- oeis: A343795