Triangle read by rows: T(n,k) is the number of primitive (aperiodic) word structures of length n using exactly k different symbols.

A137651

Triangle read by rows: T(n,k) is the number of primitive (aperiodic) word structures of length n using exactly k different symbols.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =3a(5) =1a(6) =0a(7) =6a(8) =6a(9) =1a(10) =0a(11) =15a(12) =25a(13) =10a(14) =1a(15) =0a(16) =27a(17) =89a(18) =65a(19) =15a(20) =1a(21) =0a(22) =63a(23) =301a(24) =350a(25) =140a(26) =21a(27) =1a(28) =0a(29) =120

External references