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A109903 as a simple table

na(n)
16
220
356
436
511
613
7680
83876
9245157
1034597290
1184672315
1212875774670
13244662670200
14800472431850
1514833897694226
16973469712824056
1748402641245296107
18191724747789809255
199989690752182277136

[6,20,56,36,11,13,680,3876,245157,34597290,
 84672315,12875774670,244662670200,800472431850,
 14833897694226,973469712824056,48402641245296107,
 191724747789809255,9989690752182277136]