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A186031 as a simple table

na(n)
10
21
31
45
510
642
7107
8429
91234
104862
1115032
1258786
13190588
14742900
152490399
169694845
1733312770
18129644790
19453999656
201767263190
216282014804
2224466267020
2388026769844
24343059613650
251246635155180
264861946401452
2717815452662152

[0,1,1,5,10,42,107,429,1234,4862,15032,58786,
 190588,742900,2490399,9694845,33312770,129644790,
 453999656,1767263190,6282014804,24466267020,
 88026769844,343059613650,1246635155180,
 4861946401452,17815452662152]