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A038154 as a simple table

na(n)
00
10
22
312
460
5320
61950
713692
8109592
9986400
109864090
11108505100
121302061332
1316926797472
14236975164790
153554627472060
1656874039553200
17966858672404672
1817403456103284402
19330665665962403980
206613313319248079980
21138879579704209680000

[0,0,2,12,60,320,1950,13692,109592,986400,9864090,
 108505100,1302061332,16926797472,236975164790,
 3554627472060,56874039553200,966858672404672,
 17403456103284402,330665665962403980,
 6613313319248079980,138879579704209680000]