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A183318 as a simple table

na(n)
121
2119
31109
47833
561755
6455509
73437801
825528515
9190243099
101412491505
1110484413673
1277772795145
13576515430247
144273815283079
1531666450138863
16234664439146089
171738444321229885
1812880327740810545
1995414952005019587

[21,119,1109,7833,61755,455509,3437801,25528515,
 190243099,1412491505,10484413673,77772795145,
 576515430247,4273815283079,31666450138863,
 234664439146089,1738444321229885,
 12880327740810545,95414952005019587]