Number of primitive (period n) step cyclic shifted sequence structures using a maximum of four different symbols.

A056441

Number of primitive (period n) step cyclic shifted sequence structures using a maximum of four different symbols.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =6a(5) =29a(6) =28a(7) =142a(8) =242a(9) =1222a(10) =1664a(11) =15935a(12) =18198a(13) =134452a(14) =376424a(15) =1415060a(16) =2634596a(17) =26534337a(18) =33499358a(19) =287001476a(20) =727425470a(21) =3332039278a(22) =5794658930a(23) =61120838930a(24) =93825569002a(25) =601444720052

External references