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A012519 as a simple table

na(n)
00
11
22
35
420
5125
61022
710145
8119240
91621625
1025018202
11431595485
128233157660
13172077583925
143910293621782
1595985774268025
162531103994315280
1771356674948823025
182141700448802291762

[0,1,2,5,20,125,1022,10145,119240,1621625,
 25018202,431595485,8233157660,172077583925,
 3910293621782,95985774268025,2531103994315280,
 71356674948823025,2141700448802291762]