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A170352 as a simple table

na(n)
01
17
242
3252
41512
59072
654432
7326592
81959552
911757312
1070543872
11423263232
122539579392
1315237476352
1491424858112
15548549148672
163291294892032
1719747769352192
18118486616113152
19710919696678912
204265518180073472

[1,7,42,252,1512,9072,54432,326592,1959552,
 11757312,70543872,423263232,2539579392,
 15237476352,91424858112,548549148672,
 3291294892032,19747769352192,118486616113152,
 710919696678912,4265518180073472]