Palindromes of form n^2 + 3*n + 1.

Terms

a(0) =1a(1) =5a(2) =11a(3) =55a(4) =131a(5) =181a(6) =505a(7) =929a(8) =1331a(9) =9119a(10) =10301a(11) =14041a(12) =15251a(13) =106601a(14) =145541a(15) =196691a(16) =1003001a(17) =1284821a(18) =1712171a(19) =9452549a(20) =100030001a(21) =106636601a(22) =112434211a(23) =160111061a(24) =174464471a(25) =924494429a(26) =950828059a(27) =990707099a(28) =1067557601a(29) =9140220419