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A056690 as a simple table

na(n)
20
30
41
51
63
75
812
927
1062
11149
12371
13952
142513
156807
1618873
1753472
18154554
19455076
201363287
214150560
2212829558
2340227005
24127843589
25411512640
261340747909
274418886387
2814724633149
2949582195801
30168638834537
31579103599979

[0,0,1,1,3,5,12,27,62,149,371,952,2513,6807,18873,
 53472,154554,455076,1363287,4150560,12829558,
 40227005,127843589,411512640,1340747909,
 4418886387,14724633149,49582195801,168638834537,
 579103599979]