a(n) = (12*n+1)*(12*n+11).

Terms

a(0) =11a(1) =299a(2) =875a(3) =1739a(4) =2891a(5) =4331a(6) =6059a(7) =8075a(8) =10379a(9) =12971a(10) =15851a(11) =19019a(12) =22475a(13) =26219a(14) =30251a(15) =34571a(16) =39179a(17) =44075a(18) =49259a(19) =54731a(20) =60491a(21) =66539a(22) =72875a(23) =79499a(24) =86411a(25) =93611a(26) =101099a(27) =108875a(28) =116939a(29) =125291