a(n) = 4*p(n-1)*p(n+1) - p(n)^2, where p(k) = k-th prime.

Terms

a(0) =31a(1) =59a(2) =171a(3) =243a(4) =579a(5) =699a(6) =1203a(7) =1675a(8) =2011a(9) =3331a(10) =3715a(11) =4683a(12) =5859a(13) =6907a(14) =8283a(15) =9451a(16) =12091a(17) =12835a(18) =14523a(19) =17107a(20) =17995a(21) =21235a(22) =24283a(23) =26547a(24) =29763a(25) =32619a(26) =33459a(27) =36483a(28) =42603a(29) =43083