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A297455 as a simple table

na(n)
121
2384
33933
452714
5693884
68800153
7113851142
81469935404
918934230754
10244239027815
113149901117365
1240617876400898
13523818982175997
146755192304479165
1587114527602334439
161123431301480583577

[21,384,3933,52714,693884,8800153,113851142,
 1469935404,18934230754,244239027815,3149901117365,
 40617876400898,523818982175997,6755192304479165,
 87114527602334439,1123431301480583577]