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A303487 as a simple table

na(n)
01
11
212
3231
46144
5208845
68648640
7422463195
823781703680
91515973484025
10107941254220800
118491022274509775
12731304510986649600
1368444451854354701125
146916953288171902976000
15750681472158682148959875
1687076954662428278259712000
1710751175443940144673035200625

[1,1,12,231,6144,208845,8648640,422463195,
 23781703680,1515973484025,107941254220800,
 8491022274509775,731304510986649600,
 68444451854354701125,6916953288171902976000,
 750681472158682148959875,
 87076954662428278259712000,
 10751175443940144673035200625]