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 | 10 |
| 3 | 32 |
| 4 | 99 |
| 5 | 299 |
| 6 | 887 |
| 7 | 2595 |
| 8 | 7508 |
| 9 | 21526 |
| 10 | 61251 |
| 11 | 173173 |
| 12 | 486925 |
| 13 | 1362627 |
| 14 | 3797374 |
| 15 | 10543724 |
| 16 | 29180067 |
| 17 | 80521055 |
| 18 | 221610563 |
| 19 | 608468451 |
| 20 | 1667040776 |
| 21 | 4558234018 |
| 22 | 12441155715 |
| 23 | 33900136297 |
| 24 | 92230468249 |
| 25 | 250570010499 |
| 26 | 679844574322 |
| 27 | 1842280003640 |