a(n) = prime(n) * prime(n+2) - 2 * prime(n+1).

Terms

a(0) =4a(1) =11a(2) =41a(3) =69a(4) =161a(5) =213a(6) =353a(7) =505a(8) =655a(9) =1011a(10) =1197a(11) =1509a(12) =1841a(13) =2185a(14) =2667a(15) =3115a(16) =3831a(17) =4197a(18) =4749a(19) =5463a(20) =5901a(21) =6865a(22) =7873a(23) =8795a(24) =9789a(25) =10601a(26) =11013a(27) =11873a(28) =13617a(29) =14549