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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 28 |
| 4 | 1128 |
| 5 | 2211 |
| 6 | 8128 |
| 7 | 118828 |
| 8 | 222111 |
| 9 | 821121 |
| 10 | 828828 |
| 11 | 881128 |
| 12 | 1188111 |
| 13 | 1828828 |
| 14 | 22221111 |
| 15 | 28218828 |
| 16 | 88811128 |
| 17 | 1821212128 |
| 18 | 2222211111 |
| 19 | 8888111128 |
| 20 | 222222111111 |
| 21 | 888881111128 |
| 22 | 22222221111111 |
| 23 | 88888811111128 |
| 24 | 1122211112118111 |
| 25 | 2222222211111111 |
[1,21,28,1128,2211,8128,118828,222111,821121, 828828,881128,1188111,1828828,22221111,28218828, 88811128,1821212128,2222211111,8888111128, 222222111111,888881111128,22222221111111, 88888811111128,1122211112118111,2222222211111111] |