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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 1213 |
| 3 | 1213121 |
| 4 | 1213121121312 |
| 5 | 121312112131212131211213 |
| 6 | 12131211213121213121121312131211213121213121 |
| 7 | 121312112131212131211213121312112131212131211213121121312121312112131213121121312 |
[1,12,1213,1213121,1213121121312, 121312112131212131211213, 12131211213121213121121312131211213121213121, 12131211213121213121121312131211213121213121121312\ 1121312121312112131213121121312] |