Number of subsets of {1,...,n} having mean=median.

Terms

a(0) =1a(1) =3a(2) =7a(3) =13a(4) =23a(5) =37a(6) =59a(7) =91a(8) =141a(9) =217a(10) =341a(11) =541a(12) =879a(13) =1453a(14) =2455a(15) =4217a(16) =7371a(17) =13047a(18) =23375a(19) =42259a(20) =77027a(21) =141299a(22) =260695a(23) =483221a(24) =899471a(25) =1680269a(26) =3149075a(27) =5918701a(28) =11153461a(29) =21067693