Number of length 6 primitive (=aperiodic or period 6) n-ary words.

Terms

a(0) =0a(1) =0a(2) =54a(3) =696a(4) =4020a(5) =15480a(6) =46410a(7) =117264a(8) =261576a(9) =530640a(10) =998910a(11) =1770120a(12) =2984124a(13) =4824456a(14) =7526610a(15) =11387040a(16) =16772880a(17) =24132384a(18) =34006086a(19) =47038680a(20) =63991620a(21) =85756440a(22) =113368794a(23) =148023216a(24) =191088600a(25) =244124400a(26) =308897550a(27) =387400104a(28) =481867596a(29) =594798120