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A218874 as a simple table

na(n)
10
20
30
40
50
60
70
80
90
101
112
124
138
1418
1536
1673
17146
18295
19590
201182
212364
224732
239464
2418929
2537858
2675721
27151442
28302878
29605756
301211504
312423008
324845968
339691936
3419383784
3538767568
3677534894
37155069788
38310139104
39620278208
401240555349

[0,0,0,0,0,0,0,0,0,1,2,4,8,18,36,73,146,295,590,
 1182,2364,4732,9464,18929,37858,75721,151442,
 302878,605756,1211504,2423008,4845968,9691936,
 19383784,38767568,77534894,155069788,310139104,
 620278208,1240555349]