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A007756 as a simple table

na(n)
10
20
31
41
52
63
711
838
9156
10638
112973
1213882
1367868
14338147
151720303
168905996
1746774728
18248918004
191340083514
207288922610
2140019870539
22221582395052
231236358849827

[0,0,1,1,2,3,11,38,156,638,2973,13882,67868,
 338147,1720303,8905996,46774728,248918004,
 1340083514,7288922610,40019870539,221582395052,
 1236358849827]