Number of equivalence classes of compositions of n where two compositions a,b are considered equivalent if the summands of a can be permuted into the summands of b with an even number of transpositions.

A218004

Number of equivalence classes of compositions of n where two compositions a,b are considered equivalent if the summands of a can be permuted into the summands of b with an even number of transpositions.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =9a(6) =14a(7) =19a(8) =27a(9) =37a(10) =51a(11) =67a(12) =91a(13) =118a(14) =156a(15) =202a(16) =262a(17) =334a(18) =430a(19) =543a(20) =690a(21) =867a(22) =1090a(23) =1358a(24) =1696a(25) =2099a(26) =2600a(27) =3201a(28) =3939a(29) =4820

External references