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A318397 as a simple table

na(n)
01
12
21
36
48
51
620
754
818
91
1070
11320
12216
1332
141
15252
161750
172000
18600
1950
201
21924
229072
2315750
248000
251350
2672
271
283432
2945276
30111132
3185750
3224500
332646
3498
351
3612870
37219648
38724416
39790272
40343000
4162720
424704
43128
441
4548620
461042470
474447872
486519744
494000752
501111320
51141120
527776
53162
541

[1,2,1,6,8,1,20,54,18,1,70,320,216,32,1,252,1750,
 2000,600,50,1,924,9072,15750,8000,1350,72,1,3432,
 45276,111132,85750,24500,2646,98,1,12870,219648,
 724416,790272,343000,62720,4704,128,1,48620,
 1042470,4447872,6519744,4000752,1111320,141120,
 7776,162,1]