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A075251 as a simple table

na(n)
36
420
56
612
770
872
9342
1042
1199
12156
13780
141806
15156
16272
171564
181332
195852
20420
21945
224070
236670
2414520
25930
261560
272970
287140
2930450
301806
311736
3216800
3326796
3456882
353192
365256
3729304
3823256
3997656
405256
4111439
4216002
4375078
44157212
458190
4613340

[6,20,6,12,70,72,342,42,99,156,780,1806,156,272,
 1564,1332,5852,420,945,4070,6670,14520,930,1560,
 2970,7140,30450,1806,1736,16800,26796,56882,3192,
 5256,29304,23256,97656,5256,11439,16002,75078,
 157212,8190,13340]