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) |
|---|---|
| 1 | 12 |
| 2 | 132 |
| 3 | 947 |
| 4 | 1332 |
| 5 | 3867 |
| 6 | 13332 |
| 7 | 133332 |
| 8 | 299492 |
| 9 | 1222692 |
| 10 | 1333332 |
| 11 | 13333332 |
| 12 | 133333332 |
| 13 | 1333333332 |
| 14 | 3944306652 |
| 15 | 13333333332 |
| 16 | 122020365307 |
| 17 | 133333333332 |
| 18 | 394329425347 |
| 19 | 988724307827 |
| 20 | 1333333333332 |
| 21 | 12528986215052 |