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A281981 as a simple table

na(n)
10
20
30
42
50
62
70
82
94
102
110
126
130
142
154
168
170
188
190
208
214
224
230
2412
258
264
274
288
290
3016
310
328
334
344
358
3622
370
386
398
4018
410
4218
430
4410
4516
466
470
4822
4912
5014
518
5210
530
5418
558
5622
578
586
590
6030
610
626
6320
6424
658
6620
670
6816
698
7028
710
7236
730
748
7516
7616
7712
7820
790
8032

[0,0,0,2,0,2,0,2,4,2,0,6,0,2,4,8,0,8,0,8,4,4,0,12,
 8,4,4,8,0,16,0,8,4,4,8,22,0,6,8,18,0,18,0,10,16,6,
 0,22,12,14,8,10,0,18,8,22,8,6,0,30,0,6,20,24,8,20,
 0,16,8,28,0,36,0,8,16,16,12,20,0,32]