Irregular triangle read by rows: T(n,k) is the number of distinct Wilf classes of subsets of exactly k patterns in S_n, for 0 <= k <= n!.

A346624

Irregular triangle read by rows: T(n,k) is the number of distinct Wilf classes of subsets of exactly k patterns in S_n, for 0 <= k <= n!.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =3a(10) =3a(11) =2a(12) =1a(13) =1a(14) =3a(15) =38a(16) =242a(17) =1100a(18) =3441a(19) =8438a(20) =15392a(21) =19002a(22) =16293a(23) =10624a(24) =5857a(25) =3044a(26) =1546a(27) =786a(28) =393a(29) =198

External references