Sum of the largest parts in the partitions of 3n into 3 parts.

Terms

a(0) =1a(1) =9a(2) =34a(3) =81a(4) =163a(5) =282a(6) =454a(7) =678a(8) =973a(9) =1335a(10) =1786a(11) =2319a(12) =2959a(13) =3696a(14) =4558a(15) =5532a(16) =6649a(17) =7893a(18) =9298a(19) =10845a(20) =12571a(21) =14454a(22) =16534a(23) =18786a(24) =21253a(25) =23907a(26) =26794a(27) =29883a(28) =33223a(29) =36780