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A004393 as a simple table

na(n)
121
13104
146216
15280840
1610668000
17359933112
1811143364232
19323295330680
208917061687820
21236236542585120
226057158960772920
23151175678720167920
243689062737122341488
2588326646952501966400
262080775440409128608600

[1,104,6216,280840,10668000,359933112,11143364232,
 323295330680,8917061687820,236236542585120,
 6057158960772920,151175678720167920,
 3689062737122341488,88326646952501966400,
 2080775440409128608600]