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A047196 as a simple table

na(n)
10
20
30
41
54
68
720
841
963
10126
11252
12392
13844
141780
152800
165995
1712545
1819595
1941951
2088634
21138866
22299411
23636524
24997640
252154104
264594244
277201692
2815584085
2933355944
3052311408
31113406028
32243374923
33381766253
34828748052

[0,0,0,1,4,8,20,41,63,126,252,392,844,1780,2800,
 5995,12545,19595,41951,88634,138866,299411,636524,
 997640,2154104,4594244,7201692,15584085,33355944,
 52311408,113406028,243374923,381766253,828748052]