Number of length n word structures with all distinct runs using an infinite alphabet.

A351642

Number of length n word structures with all distinct runs using an infinite alphabet.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =74a(7) =218a(8) =668a(9) =2116a(10) =6928a(11) =23254a(12) =79998a(13) =281694a(14) =1011956a(15) =3704900a(16) =13815692a(17) =52386978a(18) =201787950a(19) =789178950a(20) =3130824160a(21) =12589367840a(22) =51287685476a(23) =211557376938a(24) =883067740514

External references