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A228309 as a simple table

na(n)
23
3105
42590
557015
61165626
722834812
8433178460
98036703675
10146451924190
112632740298188
1246790614294788
13824017920352900
1414397367664647800
15249906966022292400
164312825574857068600
1774063143648813911075

[3,105,2590,57015,1165626,22834812,433178460,
 8036703675,146451924190,2632740298188,
 46790614294788,824017920352900,14397367664647800,
 249906966022292400,4312825574857068600,
 74063143648813911075]