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 | 1 |
| 2 | 4 |
| 3 | 17 |
| 4 | 56 |
| 5 | 172 |
| 6 | 498 |
| 7 | 1395 |
| 8 | 3820 |
| 9 | 10307 |
| 10 | 27534 |
| 11 | 73064 |
| 12 | 193012 |
| 13 | 508341 |
| 14 | 1336132 |
| 15 | 3507189 |
| 16 | 9197732 |
| 17 | 24107124 |
| 18 | 63159782 |
| 19 | 165433895 |
| 20 | 433246860 |
| 21 | 1134484871 |
| 22 | 2970509594 |
| 23 | 7777554192 |
| 24 | 20363014056 |
| 25 | 53312938537 |
| 26 | 139578241348 |