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A155671 as a simple table

na(n)
01
12
220
3272
43440
540952
6468560
75217032
856953280
9612579512
106513215600
1168618940392
12717570463520
137458134171672
1477123207545040
15794108867905352
168146979811148160
1783322818300333432
18849905364703000880

[1,2,20,272,3440,40952,468560,5217032,56953280,
 612579512,6513215600,68618940392,717570463520,
 7458134171672,77123207545040,794108867905352,
 8146979811148160,83322818300333432,
 849905364703000880]