Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of six different symbols.

A056405

Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of six different symbols.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =17a(5) =112a(6) =160a(7) =1182a(8) =3526a(9) =27550a(10) =60332a(11) =863283a(12) =1636608a(13) =19121869a(14) =84580104a(15) =501914374a(16) =1492170608a(17) =23751681540a(18) =47340359590a(19) =637742792823

External references