Number of compositions of n into exactly n nonnegative parts such that each positive i-th part has the same parity as i.

A348478

Number of compositions of n into exactly n nonnegative parts such that each positive i-th part has the same parity as i.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =4a(4) =7a(5) =23a(6) =55a(7) =164a(8) =407a(9) =1235a(10) =3051a(11) =9432a(12) =23431a(13) =72989a(14) =182624a(15) =571384a(16) =1436855a(17) =4511979a(18) =11387467a(19) =35866100a(20) =90782837a(21) =286622226a(22) =727226578a(23) =2300578392a(24) =5848776767a(25) =18533394763a(26) =47197285045a(27) =149769168304a(28) =381956145802

External references