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

A056377

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

Terms

    a(0) =0a(1) =0a(2) =3a(3) =21a(4) =39a(5) =288a(6) =309a(7) =1659a(8) =3102a(9) =14148a(10) =17157a(11) =136227a(12) =130995a(13) =790128a(14) =1791489a(15) =5427597a(16) =8047839a(17) =64467180a(18) =64486017a(19) =437324331a(20) =871627041a(21) =3136899816a(22) =4278115101a(23) =35355632943a(24) =42359479638

External references