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A166538 as a simple table

na(n)
01
18
256
3392
42744
519208
6134456
7941192
86588344
946118408
10322828856
112259801992
1215818613916
13110730297216
14775112079168
155425784544768
1637980491747520
17265863441771648
181861044089174592
1913027308601633536

[1,8,56,392,2744,19208,134456,941192,6588344,
 46118408,322828856,2259801992,15818613916,
 110730297216,775112079168,5425784544768,
 37980491747520,265863441771648,1861044089174592,
 13027308601633536]