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A067142 as a simple table

na(n)
00
10
21
31
44
510
630
7106
8316
91254
104140
1117128
1263856
13271492
141126216
154936608
1622278712
17101330506
18487735440
192313734596
2011706759352
2158073844300
22305941244576
231587272257096
248656011151184
2546886237603400
26263791190603200
271487539434072976

[0,0,1,1,4,10,30,106,316,1254,4140,17128,63856,
 271492,1126216,4936608,22278712,101330506,
 487735440,2313734596,11706759352,58073844300,
 305941244576,1587272257096,8656011151184,
 46886237603400,263791190603200,1487539434072976]