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A166557 as a simple table

na(n)
01
112
2132
31452
415972
5175692
61932612
721258732
8233846052
92572306572
1028295372292
11311249095212
123423740047266
1337661140519200
14414272545703280
154556998002648960
1650126978028180240
17551396758299441120
186065364341177895600
1966719007751681327680

[1,12,132,1452,15972,175692,1932612,21258732,
 233846052,2572306572,28295372292,311249095212,
 3423740047266,37661140519200,414272545703280,
 4556998002648960,50126978028180240,
 551396758299441120,6065364341177895600,
 66719007751681327680]