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

A056403

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =16a(5) =102a(6) =130a(7) =800a(8) =1889a(9) =11089a(10) =17598a(11) =179255a(12) =233448a(13) =1865925a(14) =5603767a(15) =22468480a(16) =44744046a(17) =477260541a(18) =636308684a(19) =5732446015a(20) =15272176563a(21) =73301037291a(22) =133274359128

External references