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A185815 as a simple table

na(n)
00
11
20
31
42
50
62
73
83
90
106
1132
126
134
140
1524
16210
17140
1810
195
200
21120
222904
231170
24400
2515
266
270
28720
2941580
3022344
313990
32910
3321
347
350
365040
37789984
38379680
3998784
4010500
411792
4228
438
440
4540320
4616961616
478595936

[0,1,0,1,2,0,2,3,3,0,6,32,6,4,0,24,210,140,10,5,0,
 120,2904,1170,400,15,6,0,720,41580,22344,3990,910,
 21,7,0,5040,789984,379680,98784,10500,1792,28,8,0,
 40320,16961616,8595936]