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A055995 as a simple table

na(n)
01
17
264
3576
45184
546656
6419904
73779136
834012224
9306110016
102754990144
1124794911296
12223154201664
132008387814976
1418075490334784
15162679413013056
161464114717117504
1713177032454057536
18118593292086517824

[1,7,64,576,5184,46656,419904,3779136,34012224,
 306110016,2754990144,24794911296,223154201664,
 2008387814976,18075490334784,162679413013056,
 1464114717117504,13177032454057536,
 118593292086517824]