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 | 2 |
| 2 | 22 |
| 3 | 202 |
| 4 | 298 |
| 5 | 2002 |
| 6 | 2022 |
| 7 | 2202 |
| 8 | 20002 |
| 9 | 20022 |
| 10 | 22002 |
| 11 | 28998 |
| 12 | 200002 |
| 13 | 200022 |
| 14 | 200202 |
| 15 | 202002 |
| 16 | 220002 |
| 17 | 632522 |
| 18 | 2000002 |
| 19 | 2000022 |
| 20 | 2000202 |
| 21 | 2020002 |
| 22 | 2020022 |
| 23 | 2200002 |
| 24 | 2200202 |
| 25 | 20000002 |
| 26 | 20000022 |
| 27 | 20000202 |
| 28 | 20002002 |
| 29 | 20002022 |
| 30 | 20002202 |