Number of primitive (aperiodic) step shifted (decimated) sequences using exactly three different symbols.

A056387

Number of primitive (aperiodic) step shifted (decimated) sequences using exactly three different symbols.

Terms

    a(0) =0a(1) =0a(2) =3a(3) =21a(4) =39a(5) =285a(6) =309a(7) =1638a(8) =3099a(9) =14109a(10) =17157a(11) =135918a(12) =130995a(13) =789819a(14) =1791447a(15) =5425938a(16) =8047839a(17) =64463793a(18) =64486017a(19) =437310162a(20) =871626729a(21) =3136882659a(22) =4278115101a(23) =35355495078a(24) =42359479599

External references