Number of primitive (aperiodic) word structures of length n using a 3-ary alphabet.

A056274

Number of primitive (aperiodic) word structures of length n using a 3-ary alphabet.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =116a(6) =364a(7) =1080a(8) =3276a(9) =9800a(10) =29524a(11) =88440a(12) =265720a(13) =796796a(14) =2391440a(15) =7173360a(16) =21523360a(17) =64566684a(18) =193710244a(19) =581120880a(20) =1743391832a(21) =5230147076a(22) =15690529804a(23) =47071499760a(24) =141214768200

External references