a(n) = prime(n+2)^2 - prime(n)^2.

Terms

a(0) =21a(1) =40a(2) =96a(3) =120a(4) =168a(5) =192a(6) =240a(7) =480a(8) =432a(9) =528a(10) =720a(11) =480a(12) =528a(13) =960a(14) =1272a(15) =912a(16) =1008a(17) =1320a(18) =840a(19) =1200a(20) =1560a(21) =1680a(22) =2520a(23) =2280a(24) =1200a(25) =1248a(26) =1272a(27) =1320a(28) =4248a(29) =4392