Number of symmetric plane partitions of n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =6a(7) =8a(8) =12a(9) =16a(10) =22a(11) =29a(12) =41a(13) =53a(14) =71a(15) =93a(16) =125a(17) =160a(18) =211a(19) =270a(20) =354a(21) =450a(22) =581a(23) =735a(24) =948a(25) =1191a(26) =1517a(27) =1902a(28) =2414a(29) =3008