a(n) = prime(a(n-2)) + abs(prime(n) - a(n-2)) with a(1)=a(2)=1.

Terms

a(0) =1a(1) =1a(2) =6a(3) =8a(4) =18a(5) =24a(6) =62a(7) =94a(8) =332a(9) =556a(10) =2538a(11) =4540a(12) =25214a(13) =48076a(14) =315026a(15) =634480a(16) =4800790a(17) =10148548a(18) =87191282a(19) =192401844a(20) =1851608846a(21) =4246380874a(22) =45266724266a(23) =107498643322