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

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =12a(5) =24a(6) =49a(7) =85a(8) =147a(9) =232a(10) =374a(11) =558a(12) =843a(13) =1223a(14) =1774a(15) =2493a(16) =3519a(17) =4835a(18) =6659a(19) =8999a(20) =12144a(21) =16152a(22) =21479a(23) =28186a(24) =36945a(25) =47959a(26) =62126a(27) =79805a(28) =102352a(29) =130286