Number of rectangular plane partitions of n with strictly decreasing rows and columns.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =7a(7) =9a(8) =12a(9) =16a(10) =22a(11) =27a(12) =36a(13) =44a(14) =57a(15) =72a(16) =89a(17) =110a(18) =139a(19) =170a(20) =210a(21) =261a(22) =318a(23) =390a(24) =478a(25) =581a(26) =705a(27) =860a(28) =1036a(29) =1252