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 | 13 |
| 2 | 90 |
| 3 | 442 |
| 4 | 1728 |
| 5 | 5720 |
| 6 | 16653 |
| 7 | 43745 |
| 8 | 105586 |
| 9 | 237354 |
| 10 | 502113 |
| 11 | 1007773 |
| 12 | 1931631 |
| 13 | 3554747 |
| 14 | 6308719 |
| 15 | 10837683 |
| 16 | 18078554 |
| 17 | 29362618 |
| 18 | 46541560 |
| 19 | 72140848 |
| 20 | 109543070 |
| 21 | 163203326 |
| 22 | 238898101 |
| 23 | 344008185 |
| 24 | 487835165 |
| 25 | 681949801 |
| 26 | 940569228 |
| 27 | 1280958420 |
| 28 | 1723849738 |
| 29 | 2293872698 |
| 30 | 3019984381 |