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A157645 as a simple table

na(n)
1220
2220
3220
4220
5220
6220
7220
8220
9220
10220
11220
12220
13220
14220
15220
16220
17220
18220
19220
20220
21220
22220
23220
24220
25220
26220
27220
28220
29220
30220
31220
32220
33220
34220
35220
36220
37220
38220
39220
40221
41221
42221
43221
44221
45221
46221
47221
48221
49221
50221
51221

[220,220,220,220,220,220,220,220,220,220,220,220,
 220,220,220,220,220,220,220,220,220,220,220,220,
 220,220,220,220,220,220,220,220,220,220,220,220,
 220,220,220,221,221,221,221,221,221,221,221,221,
 221,221,221]