Number of compositions of n where the median of parts equals 1.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =10a(5) =21a(6) =43a(7) =81a(8) =161a(9) =325a(10) =637a(11) =1260a(12) =2520a(13) =4999a(14) =9917a(15) =19770a(16) =39354a(17) =78275a(18) =155969a(19) =310818a(20) =619174a(21) =1234199a(22) =2460905a(23) =4906597a(24) =9785125a(25) =19518887a(26) =38937907a(27) =77686076a(28) =155017552a(29) =309355889