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A107680 as a simple table

na(n)
00
11
21
34
44
54
64
713
813
913
1013
1113
1213
1313
1413
1540
1640
1740
1840
1940
2040
2140
2240
2340
2440
2540
2640
2740
2840
2940
3040
31121
32121
33121
34121
35121
36121
37121
38121
39121
40121
41121
42121
43121
44121
45121
46121
47121
48121
49121
50121
51121
52121
53121
54121
55121
56121
57121
58121
59121
60121
61121

[0,1,1,4,4,4,4,13,13,13,13,13,13,13,13,40,40,40,
 40,40,40,40,40,40,40,40,40,40,40,40,40,121,121,
 121,121,121,121,121,121,121,121,121,121,121,121,
 121,121,121,121,121,121,121,121,121,121,121,121,
 121,121,121,121,121]