Number of length n word structures with all distinct run-lengths using at most 3 symbols.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =17a(7) =19a(8) =31a(9) =45a(10) =153a(11) =167a(12) =287a(13) =397a(14) =613a(15) =1695a(16) =2007a(17) =3185a(18) =4565a(19) =6799a(20) =9235a(21) =24057a(22) =27645a(23) =44483a(24) =61619a(25) =92089a(26) =122857a(27) =179355a(28) =385995a(29) =468605