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A203538 as a simple table

na(n)
10
216
3144
43364
530976
6614656
78479744
8129504400
91978826256
1029961532836
11454089995044
126895434839056
13104626058201344
141587468792674704
1524091008317030656
16365573436678862864
175547427717263648804

[0,16,144,3364,30976,614656,8479744,129504400,
 1978826256,29961532836,454089995044,6895434839056,
 104626058201344,1587468792674704,
 24091008317030656,365573436678862864,
 5547427717263648804]