Sum of the traces of all plane partitions of n.

Terms

a(0) =1a(1) =4a(2) =10a(3) =26a(4) =56a(5) =126a(6) =252a(7) =512a(8) =980a(9) =1866a(10) =3427a(11) =6258a(12) =11121a(13) =19618a(14) =33975a(15) =58328a(16) =98732a(17) =165804a(18) =275246a(19) =453544a(20) =740338a(21) =1200088a(22) =1929897a(23) =3083898a(24) =4893775a(25) =7720826a(26) =12106814a(27) =18883104a(28) =29291740a(29) =45215386