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A050182 as a simple table

na(n)
00
11
23
312
440
5143
6497
71768
86288
922610
1081686
11297160
121086384
133991995
1414732005
1554587280
16202995232
17757398510
182834502346
1910637507400
2040023606896
21150946230006
22570534474698
232160865067312
248199711007200

[0,1,3,12,40,143,497,1768,6288,22610,81686,297160,
 1086384,3991995,14732005,54587280,202995232,
 757398510,2834502346,10637507400,40023606896,
 150946230006,570534474698,2160865067312,
 8199711007200]