Number of (3,n)-partitions of a chain of length n^2.

Terms

a(0) =0a(1) =0a(2) =1a(3) =35a(4) =286a(5) =1330a(6) =4495a(7) =12341a(8) =29260a(9) =62196a(10) =121485a(11) =221815a(12) =383306a(13) =632710a(14) =1004731a(15) =1543465a(16) =2303960a(17) =3353896a(18) =4775385a(19) =6666891a(20) =9145270a(21) =12347930a(22) =16435111a(23) =21592285a(24) =28032676a(25) =35999900a(26) =45770725a(27) =57657951a(28) =72013410