Number of square plane partitions of n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =5a(8) =8a(9) =11a(10) =16a(11) =21a(12) =31a(13) =41a(14) =57a(15) =78a(16) =108a(17) =146a(18) =202a(19) =274a(20) =375a(21) =509a(22) =690a(23) =929a(24) =1255a(25) =1679a(26) =2246a(27) =2991a(28) =3979a(29) =5266