Number of column-strict plane partitions of n.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =23a(5) =45a(6) =87a(7) =160a(8) =290a(9) =512a(10) =889a(11) =1514a(12) =2547a(13) =4218a(14) =6909a(15) =11184a(16) =17926a(17) =28449a(18) =44772a(19) =69862a(20) =108205a(21) =166371a(22) =254107a(23) =385617a(24) =581729a(25) =872535a(26) =1301722a(27) =1932006a(28) =2853530a(29) =4194867