Number of equivalence classes, modulo transposition, of non-symmetric plane partitions of n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =10a(6) =21a(7) =39a(8) =74a(9) =133a(10) =239a(11) =415a(12) =719a(13) =1216a(14) =2048a(15) =3393a(16) =5586a(17) =9087a(18) =14695a(19) =23530a(20) =37462a(21) =59172a(22) =92947a(23) =145024a(24) =225123a(25) =347421a(26) =533614a(27) =815378a(28) =1240410a(29) =1878302