Number of permutations of length n in the class of juxtapositions of separable permutations with 21-avoiders.
A326348
Number of permutations of length n in the class of juxtapositions of separable permutations with 21-avoiders.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =115a(6) =609a(7) =3409a(8) =19728a(9) =116692a(10) =701062a(11) =4261581a(12) =26146111a(13) =161631115a(14) =1005522262a(15) =6289410686a(16) =39525228204a(17) =249427451071
External references
- oeis: A326348