Number of length 4 1..(n+2) arrays with no leading partial sum equal to a prime.

Terms

a(0) =2a(1) =20a(2) =45a(3) =160a(4) =222a(5) =576a(6) =1026a(7) =1849a(8) =2461a(9) =4195a(10) =5217a(11) =8052a(12) =11098a(13) =15300a(14) =18210a(15) =25269a(16) =29296a(17) =38791a(18) =48468a(19) =60634a(20) =68591a(21) =87149a(22) =104149a(23) =126729a(24) =149195a(25) =177607a(26) =196492a(27) =236417a(28) =258581a(29) =301770