Number of multisets of nonempty words with a total of n letters over binary alphabet containing the second letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293797
Number of multisets of nonempty words with a total of n letters over binary alphabet containing the second letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =24a(4) =62a(5) =140a(6) =329a(7) =725a(8) =1631a(9) =3548a(10) =7820a(11) =16887a(12) =36767a(13) =79046a(14) =170799a(15) =365883a(16) =786361a(17) =1679486a(18) =3594580a(19) =7656839a(20) =16331933a(21) =34705064a(22) =73810524a(23) =156501393a(24) =332001987a(25) =702530049a(26) =1486995062a(27) =3140712201a(28) =6634309660a(29) =13988510961
External references
- oeis: A293797