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A047172 as a simple table

na(n)
10
20
31
43
56
613
721
845
970
10154
11235
12525
13791
141793
152681
166153
179150
1821206
1931401
2073359
21108262
22254607
23374715
24886171
251301235
263091971
274531423
2810811671
2915818791
3037877401
3155339849
32132924649
33193962894
34467187454

[0,0,1,3,6,13,21,45,70,154,235,525,791,1793,2681,
 6153,9150,21206,31401,73359,108262,254607,374715,
 886171,1301235,3091971,4531423,10811671,15818791,
 37877401,55339849,132924649,193962894,467187454]