Number of sets of nonempty words over binary alphabet with a total of n letters of which 2 are the first letter.
A360650
Number of sets of nonempty words over binary alphabet with a total of n letters of which 2 are the first letter.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =6a(4) =16a(5) =37a(6) =73a(7) =133a(8) =227a(9) =370a(10) =580a(11) =881a(12) =1305a(13) =1890a(14) =2687a(15) =3756a(16) =5175a(17) =7037a(18) =9460a(19) =12582a(20) =16577a(21) =21649a(22) =28048a(23) =36070a(24) =46072a(25) =58474a(26) =73778a(27) =92574a(28) =115559a(29) =143551
External references
- oeis: A360650