a(n) = 729*n^2 + 2*n.

Terms

a(0) =731a(1) =2920a(2) =6567a(3) =11672a(4) =18235a(5) =26256a(6) =35735a(7) =46672a(8) =59067a(9) =72920a(10) =88231a(11) =105000a(12) =123227a(13) =142912a(14) =164055a(15) =186656a(16) =210715a(17) =236232a(18) =263207a(19) =291640a(20) =321531a(21) =352880a(22) =385687a(23) =419952a(24) =455675a(25) =492856a(26) =531495a(27) =571592a(28) =613147a(29) =656160