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

Terms

a(0) =0a(1) =15a(2) =253a(3) =1653a(4) =6786a(5) =21115a(6) =54615a(7) =123753a(8) =253828a(9) =481671a(10) =858705a(11) =1454365a(12) =2359878a(13) =3692403a(14) =5599531a(15) =8264145a(16) =11909640a(17) =16805503a(18) =23273253a(19) =31692741a(20) =42508810a(21) =56238315a(22) =73477503a(23) =94909753a(24) =121313676a(25) =153571575a(26) =192678265a(27) =239750253a(28) =296035278a(29) =362922211