Palindromes of form k^2 + k + 4.

Terms

a(0) =4a(1) =6a(2) =424a(3) =40204a(4) =48184a(5) =68386a(6) =4002004a(7) =4992994a(8) =6510156a(9) =6830386a(10) =400020004a(11) =424545424a(12) =40000200004a(13) =41162526114a(14) =42314341324a(15) =47678687674