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A273624 as a simple table

na(n)
11
215
3248
44305
576255
61361520
724384737
8437245935
97843863784
10140737371825
112525326494911
1245314438127840
13813129752279233
1414590988151618255
15261824431125415640
164698247224097107345
1784306614992412658847
181512820749915870503760
1927146466385039244529569

[1,15,248,4305,76255,1361520,24384737,437245935,
 7843863784,140737371825,2525326494911,
 45314438127840,813129752279233,14590988151618255,
 261824431125415640,4698247224097107345,
 84306614992412658847,1512820749915870503760,
 27146466385039244529569]