Number of multisets of n nonempty words with a total of 2n letters over binary alphabet.

A359962

Number of multisets of n nonempty words with a total of 2n letters over binary alphabet.

Terms

    a(0) =1a(1) =4a(2) =26a(3) =132a(4) =623a(5) =2632a(6) =10500a(7) =39384a(8) =141659a(9) =490100a(10) =1644186a(11) =5366436a(12) =17113433a(13) =53454528a(14) =163963312a(15) =494786352a(16) =1471423866a(17) =4318092136a(18) =12520027756a(19) =35901819336a(20) =101909674398a(21) =286575107424a(22) =798886300056

External references