Number of ways to partition 2*n into distinct positive integers not greater than n.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =3a(6) =5a(7) =8a(8) =13a(9) =21a(10) =31a(11) =46a(12) =67a(13) =95a(14) =134a(15) =186a(16) =253a(17) =343a(18) =461a(19) =611a(20) =806a(21) =1055a(22) =1369a(23) =1768a(24) =2270a(25) =2896a(26) =3678a(27) =4649a(28) =5847a(29) =7325