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A026129 as a simple table

na(n)
01
12
216
3120
4945
57630
662678
7521264
84375359
936990200
10314520602
112686858784
1223042640803
13198266292798
141710759087810
1514797477375776
16128266110749332
171113914431675710
189689827680172220
1984416582373480000
20736413484617492927
216431941663589330086
2256239398241150978776

[1,2,16,120,945,7630,62678,521264,4375359,
 36990200,314520602,2686858784,23042640803,
 198266292798,1710759087810,14797477375776,
 128266110749332,1113914431675710,9689827680172220,
 84416582373480000,736413484617492927,
 6431941663589330086,56239398241150978776]