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A270678 as a simple table

na(n)
01
18
244
3212
4940
53857
615648
762928
8251952
91005696
104021440
1116072420
1264261572
13256960036
141027642244
154110139460

[1,8,44,212,940,3857,15648,62928,251952,1005696,
 4021440,16072420,64261572,256960036,1027642244,
 4110139460]