a(n) = (11*n + 9)^2.

Terms

a(0) =81a(1) =400a(2) =961a(3) =1764a(4) =2809a(5) =4096a(6) =5625a(7) =7396a(8) =9409a(9) =11664a(10) =14161a(11) =16900a(12) =19881a(13) =23104a(14) =26569a(15) =30276a(16) =34225a(17) =38416a(18) =42849a(19) =47524a(20) =52441a(21) =57600a(22) =63001a(23) =68644a(24) =74529a(25) =80656a(26) =87025a(27) =93636a(28) =100489a(29) =107584