Number of equivalence classes of 132-avoiding permutations of [n], where two permutations are equivalent if they have the same set of pure descents.

A295704

Number of equivalence classes of 132-avoiding permutations of [n], where two permutations are equivalent if they have the same set of pure descents.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =66a(7) =169a(8) =437a(9) =1130a(10) =2926a(11) =7597a(12) =19749a(13) =51381a(14) =133812a(15) =348755a(16) =909464a(17) =2372862a(18) =6193720

External references