Number of length 3 1..(n+2) arrays with no leading or trailing partial sum equal to a prime.

Terms

a(0) =0a(1) =2a(2) =4a(3) =17a(4) =18a(5) =47a(6) =68a(7) =119a(8) =131a(9) =226a(10) =237a(11) =370a(12) =475a(13) =644a(14) =678a(15) =949a(16) =985a(17) =1303a(18) =1544a(19) =1903a(20) =1966a(21) =2511a(22) =2864a(23) =3440a(24) =3890a(25) =4564a(26) =4716a(27) =5658a(28) =5781a(29) =6672