a(1) = 4^16 * 16^4 = 8^8 * 8^8 = 281474976710656
a(2) = 3^27 * 27^3 = 9^9 * 9^9 = 150094635296999121.
a(3) = 10^80 * 80^10 = 20^50 * 50^20 =
1073741824000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.
a(4) = 2^324 * 324^2 = 8^96 * 96^8 =
3587638001325335308951996778029678444520536159022591698847370237163925406936776358067367488612064034816.
a(5) = 8^144 * 144^8 = 16^96 * 96^16.
a(6) = 16^144 * 144^16 = 32^96 * 96^32.
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