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A171851 as a simple table

na(n)
00
10
20
31
44
514
646
7140
8412
91186
103354
119368
1225920
1371182
14194322
15527927
161428530
173852594
1810360700
1927795561
2074414408
21198862280
22530590812
231413712094
243762056094
2510000260036
2626556402534
2770459947925
28186796151768

[0,0,0,1,4,14,46,140,412,1186,3354,9368,25920,
 71182,194322,527927,1428530,3852594,10360700,
 27795561,74414408,198862280,530590812,1413712094,
 3762056094,10000260036,26556402534,70459947925,
 186796151768]