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A014566号作为一个简单的表

n个a(n)
02
12
25
28
4257
53126
646657
7823544
816777217
9387420490
1010000000001
11285311670612
128916100448257
13302875106592254
1411112006825558017
15437893890380859376
1618446744073709551617
17827240261886336764178
1839346408075296537575425
191978419655660313589123980

[2,2,5,28,257,3126,46657,823544,16777217,387420490,10000000001,285311670612,8916100448257,302875106592254,11112006825558017,437893890380859376,18446744073709551617,827240261886336764178,39346408075296537575425,1978419655660313589123980]