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

A056440

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =5a(5) =18a(6) =15a(7) =60a(8) =80a(9) =293a(10) =295a(11) =2217a(12) =1777a(13) =9763a(14) =20632a(15) =58362a(16) =79553a(17) =600696a(18) =567543a(19) =3671674a(20) =6935728a(21) =23785615a(22) =31017007a(23) =246154210a(24) =282456327a(25) =1357925621a(26) =2615206650a(27) =11358502734

External references