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 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 5 |
| 5 | 9 |
| 6 | 19 |
| 7 | 148 |
| 8 | 209 |
| 9 | 404 |
| 10 | 652 |
| 11 | 763 |
| 12 | 1739 |
| 13 | 2790 |
| 14 | 9551 |
| 15 | 11117 |
| 16 | 13173 |
| 17 | 25641 |
| 18 | 170003 |
| 19 | 181927 |
| 20 | 519900 |
| 21 | 3253342 |
| 22 | 4816257 |
| 23 | 7103608 |
| 24 | 8269588 |
| 25 | 64261168 |
| 26 | 177847445 |
| 27 | 294878941 |
| 28 | 819667577 |
| 29 | 844965349 |
| 30 | 2944185248 |