This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1311 |
| 3 | 2331 |
| 4 | 331241 |
| 5 | 14432231 |
| 6 | 34433241 |
| 7 | 54533231 |
| 8 | 2544632221 |
| 9 | 163534435221 |
| 10 | 263544436231 |
| 11 | 363554634231 |
| 12 | 463554733221 |
| 13 | 17364544733221 |
| 14 | 37263554634231 |
| 15 | 37363554734231 |
| 16 | 37364544933221 |
| 17 | 1937263554933221 |
| 18 | 3927263544835231 |
| 19 | 391827264534836231 |
| 20 | 293827363544836231 |