Number of non-isomorphic square multiset partitions of weight n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =27a(6) =80a(7) =230a(8) =719a(9) =2271a(10) =7519a(11) =25425a(12) =88868a(13) =317972a(14) =1168360a(15) =4392724a(16) =16903393a(17) =66463148a(18) =266897917a(19) =1093550522a(20) =4568688612a(21) =19448642187a(22) =84308851083a(23) =371950915996