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A168660 as a simple table

na(n)
00
11
2576
330618
4532480
54921875
630373056
7141649396
8537919488
91745783685
105005000000
1112978455886
1230976598016
1368960620183
14144680034240
15288410625000
16549890031616
171008202119561
181785539723328
193065980064770

[0,1,576,30618,532480,4921875,30373056,141649396,
 537919488,1745783685,5005000000,12978455886,
 30976598016,68960620183,144680034240,288410625000,
 549890031616,1008202119561,1785539723328,
 3065980064770]