Number of compositions of n with difference -3 between the number of odd parts and the number of even parts, both counted without multiplicity.

A242838

Number of compositions of n with difference -3 between the number of odd parts and the number of even parts, both counted without multiplicity.

Terms

    a(0) =6a(1) =0a(2) =18a(3) =0a(4) =56a(5) =0a(6) =146a(7) =0a(8) =312a(9) =120a(10) =1037a(11) =1440a(12) =4658a(13) =9624a(14) =23906a(15) =52524a(16) =117032a(17) =255732a(18) =542186a(19) =1150920a(20) =2370395a(21) =4902948a(22) =9912558a(23) =20084700a(24) =40045005a(25) =79902108a(26) =157676536a(27) =310969848a(28) =608833717a(29) =1190681692

External references