Number of partitions of n such that (greatest part) + (least part) = number of parts.

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =1a(5) =1a(6) =1a(7) =4a(8) =2a(9) =4a(10) =5a(11) =7a(12) =8a(13) =13a(14) =12a(15) =18a(16) =22a(17) =30a(18) =33a(19) =46a(20) =51a(21) =69a(22) =81a(23) =102a(24) =120a(25) =155a(26) =179a(27) =224a(28) =265a(29) =326