a(n) = (18*n + 1)*(24*n + 1)*(144*n + 11).

Terms

a(0) =11a(1) =73625a(2) =542087a(3) =1778645a(4) =4156547a(5) =8049041a(6) =13829375a(7) =21870797a(8) =32546555a(9) =46229897a(10) =63294071a(11) =84112325a(12) =109057907a(13) =138504065a(14) =172824047a(15) =212391101a(16) =257578475a(17) =308759417a(18) =366307175a(19) =430594997a(20) =501996131a(21) =580883825a(22) =667631327a(23) =762611885a(24) =866198747a(25) =978765161a(26) =1100684375