The following terms for a(29) to a(61) have been found. Terms with asterisks have mathematically possible lower values (given in brackets) that fulfill the criteria but no matching practical configuration has been found or proven not to exist. 

1 1
2 3
3 4
4 6
5 8
6 11
7 14
8 16
9 20
10 24
11 28
12 32
13 36
14 42
15 48
16 54
17 60
18 66
19 72
20 80
21 88
22 96
23 104
24 112
25 120
26 130
27 140
28 150
29 158* (157)
30 168
31 180
32 192
33 204* (203)
34 216* (215)
35 226* (225)
36 238
37 252
38 264
39 278* (277)
40 289
41 306
42 320
43 336
44 351
45 366* (365)
46 379
47 396
48 414
49 432
50 448
51 462
52 482* (480)
53 500
54 520
55 540
56 558* (557)
57 576* (575)
58 594
59 616
60 638
61 660