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A183308 as a simple table

na(n)
18
222
3205
41798
519899
6206755
72160250
822504107
9234636215
102447317278
1125539919635
12266563403686
132782185688787
1429038350922976
15303075629656107
163163217395827118
1733014647369487612
18344575588242732515

[8,22,205,1798,19899,206755,2160250,22504107,
 234636215,2447317278,25539919635,266563403686,
 2782185688787,29038350922976,303075629656107,
 3163217395827118,33014647369487612,
 344575588242732515]