Number of multisets of nonempty words with a total of n letters over binary alphabet such that all letters occur at least once in the multiset.

A261043

Number of multisets of nonempty words with a total of n letters over binary alphabet such that all letters occur at least once in the multiset.

Terms

    a(0) =0a(1) =0a(2) =3a(3) =14a(4) =49a(5) =148a(6) =427a(7) =1170a(8) =3150a(9) =8288a(10) =21562a(11) =55368a(12) =140998a(13) =355854a(14) =892014a(15) =2220856a(16) =5497483a(17) =13533264a(18) =33150801a(19) =80825768a(20) =196218139a(21) =474423934a(22) =1142756063a(23) =2742781794a(24) =6561049181a(25) =15645058210a(26) =37194447065a(27) =88174246904a(28) =208463588035a(29) =491585765888

External references