Number of compositions of n with difference -1 between the number of odd parts and the number of even parts, both counted without multiplicity.

A242840

Number of compositions of n with difference -1 between the number of odd parts and the number of even parts, both counted without multiplicity.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =0a(4) =2a(5) =6a(6) =15a(7) =44a(8) =74a(9) =202a(10) =351a(11) =766a(12) =1301a(13) =2626a(14) =4677a(15) =8993a(16) =16466a(17) =31671a(18) =60266a(19) =116751a(20) =229180a(21) =452667a(22) =905627a(23) =1815394a(24) =3673666a(25) =7429123a(26) =15109955a(27) =30696510a(28) =62512866a(29) =127140993

External references