Number of partitions p of n such that n - 2*(number of parts of p) is a part of p.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =4a(7) =4a(8) =9a(9) =9a(10) =18a(11) =18a(12) =31a(13) =31a(14) =51a(15) =51a(16) =79a(17) =79a(18) =119a(19) =119a(20) =173a(21) =173a(22) =248a(23) =248a(24) =347a(25) =347a(26) =480a(27) =480a(28) =654a(29) =654