Number of compositions of n with difference -4 between the number of odd parts and the number of even parts, both counted without multiplicity.

A242837

Number of compositions of n with difference -4 between the number of odd parts and the number of even parts, both counted without multiplicity.

Terms

    a(0) =24a(1) =0a(2) =84a(3) =0a(4) =288a(5) =0a(6) =822a(7) =0a(8) =2226a(9) =0a(10) =5304a(11) =720a(12) =15034a(13) =10680a(14) =55624a(15) =84360a(16) =265200a(17) =527640a(18) =1342608a(19) =2886960a(20) =6673176a(21) =14433240a(22) =31725930a(23) =67718568a(24) =144265370a(25) =302771208a(26) =631156708a(27) =1303769496a(28) =2673673704a(29) =5447789784

External references