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A113668 as a simple table

na(n)
01
18
2156
34696
4186406
59053640
6515875660
733585910968
82453913830097
9198609146859416
1017630476159933080
111703025192274201272
12177846105338917975896
1319968484152350242447288

[1,8,156,4696,186406,9053640,515875660,
 33585910968,2453913830097,198609146859416,
 17630476159933080,1703025192274201272,
 177846105338917975896,19968484152350242447288]