Number of primitive (aperiodic) word structures of length n which contain exactly five different symbols.

A056281

Number of primitive (aperiodic) word structures of length n which contain exactly five different symbols.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =15a(6) =140a(7) =1050a(8) =6951a(9) =42524a(10) =246730a(11) =1379385a(12) =7508501a(13) =40074895a(14) =210766919a(15) =1096189500a(16) =5652751651a(17) =28958088579a(18) =147589284710a(19) =749206047975

External references