Number of primitive (no repeated characters) and irreducible (not the concatenation of generatable strings) strings obtained from abc by iterated repetition of substrings in place.
A135157
Number of primitive (no repeated characters) and irreducible (not the concatenation of generatable strings) strings obtained from abc by iterated repetition of substrings in place.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =0a(4) =3a(5) =1a(6) =4a(7) =0a(8) =5a(9) =2a(10) =6a(11) =0a(12) =7a(13) =3a(14) =8a(15) =0a(16) =9a(17) =6a(18) =10a(19) =0a(20) =11a(21) =12a(22) =12a(23) =4a(24) =13a(25) =24a(26) =14a(27) =23a(28) =15a(29) =54
External references
- oeis: A135157