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A169970 as a simple table

na(n)
01
11
22
32
46
58
628
748
8244
9476
102544
115952
1235600
1394456
14659632
151984176
1615106128
1751493696

[1,1,2,2,6,8,28,48,244,476,2544,5952,35600,94456,
 659632,1984176,15106128,51493696]