a(n) = A128921(n)^2.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =121a(5) =484a(6) =1089a(7) =9801a(8) =10201a(9) =12321a(10) =14641a(11) =40804a(12) =44944a(13) =1002001a(14) =1234321a(15) =4008004a(16) =100020001a(17) =102030201a(18) =104060401a(19) =121242121a(20) =123454321a(21) =125686521a(22) =400080004a(23) =404090404a(24) =10000200001a(25) =10221412201a(26) =12102420121a(27) =12345654321a(28) =40000800004