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A241247 as a simple table

na(n)
12
221
3352
48065
5231876
67951069
7314931968
814095941633
9701590424500
1038358147922501
112281458125531520
12146469277526152321
1310084388675810865248
14740560093656498673965
1557738578482070455269376
164760258648137662340202497
17413561386818608994516491316

[2,21,352,8065,231876,7951069,314931968,
 14095941633,701590424500,38358147922501,
 2281458125531520,146469277526152321,
 10084388675810865248,740560093656498673965,
 57738578482070455269376,4760258648137662340202497,
 413561386818608994516491316]