The number of overpartitions of n having an equal number of overlined and non-overlined parts.

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =3a(5) =5a(6) =7a(7) =11a(8) =15a(9) =23a(10) =31a(11) =45a(12) =61a(13) =85a(14) =114a(15) =156a(16) =206a(17) =276a(18) =363a(19) =477a(20) =621a(21) =808a(22) =1041a(23) =1339a(24) =1713a(25) =2182a(26) =2769a(27) =3501a(28) =4409a(29) =5534