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A183285 as a simple table

na(n)
12
218
3180
42184
528440
6385316
75358022
875912216
91090973732
1015858156696
11232676544078
123440947655952
1351232791119120
14767336873453826
1511552848716881830
16174745834818648930
172654168057004043584

[2,18,180,2184,28440,385316,5358022,75912216,
 1090973732,15858156696,232676544078,3440947655952,
 51232791119120,767336873453826,11552848716881830,
 174745834818648930,2654168057004043584]