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A175990 as a simple table

na(n)
21
32
40
53
61
74
83
90
105
116
121
136
1410
154
160
177
1815
1910
201
218
2221
2320
245
250
269
2728
2835
2915
301
3110
3236
3356
3435
356
360
3711
3845
3984
4070
4121
421
4312
4455
45120
46126
4756
487
490
5013
5166
52165
53210
54126
5528
561
5714
5878
59220
60330
61252
6284
638
640
6515
6691
67286
68495
69462
70210
7136
721
7316
74105
75364
76715
77792
78462
79120
809
810
8217
83120

[1,2,0,3,1,4,3,0,5,6,1,6,10,4,0,7,15,10,1,8,21,20,
 5,0,9,28,35,15,1,10,36,56,35,6,0,11,45,84,70,21,1,
 12,55,120,126,56,7,0,13,66,165,210,126,28,1,14,78,
 220,330,252,84,8,0,15,91,286,495,462,210,36,1,16,
 105,364,715,792,462,120,9,0,17,120]