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A002931 as a simple table

na(n)
10
21
32
47
528
6124
7588
82938
915268
1081826
11449572
122521270
1314385376
1483290424
15488384528
162895432660
1717332874364
18104653427012
19636737003384
203900770002646
2124045500114388
22149059814328236
23928782423033008
245814401613289290
2536556766640745936

[0,1,2,7,28,124,588,2938,15268,81826,449572,
 2521270,14385376,83290424,488384528,2895432660,
 17332874364,104653427012,636737003384,
 3900770002646,24045500114388,149059814328236,
 928782423033008,5814401613289290,
 36556766640745936]