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A047199 as a simple table

na(n)
10
20
30
40
50
64
710
820
960
10105
11168
12364
13588
14930
152250
163960
176820
1817380
1930745
2052507
21126763
22219765
23372120
24898380
251572228
262702252
276619596
2811666760
2920167170
3049146654
3186461704
32149465844
33363087604
34639438019

[0,0,0,0,0,4,10,20,60,105,168,364,588,930,2250,
 3960,6820,17380,30745,52507,126763,219765,372120,
 898380,1572228,2702252,6619596,11666760,20167170,
 49146654,86461704,149465844,363087604,639438019]