Number of partitions p of 2n-1 such that n - (number of parts of p) is a part of p.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =9a(5) =21a(6) =37a(7) =69a(8) =113a(9) =187a(10) =286a(11) =449a(12) =657a(13) =976a(14) =1397a(15) =2003a(16) =2788a(17) =3902a(18) =5323a(19) =7284a(20) =9789a(21) =13144a(22) =17405a(23) =23052a(24) =30142a(25) =39379a(26) =50967a(27) =65842a(28) =84368a(29) =107954