Number of unordered pairs of strict integer partitions of n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =6a(6) =10a(7) =15a(8) =21a(9) =36a(10) =55a(11) =78a(12) =120a(13) =171a(14) =253a(15) =378a(16) =528a(17) =741a(18) =1081a(19) =1485a(20) =2080a(21) =2926a(22) =4005a(23) =5460a(24) =7503a(25) =10153a(26) =13695a(27) =18528a(28) =24753a(29) =32896