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A056310 as a simple table

na(n)
10
20
33
418
578
6273
7921
82916
99150
1028065
1185773
12259848
13785778
142367813
157128201
1621427956
1764382550
18193326105
19580372293
201741847328
215227116378
2215684323853
2347059266081
24141189861996

[0,0,3,18,78,273,921,2916,9150,28065,85773,259848,
 785778,2367813,7128201,21427956,64382550,
 193326105,580372293,1741847328,5227116378,
 15684323853,47059266081,141189861996]