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 | 4 |
| 3 | 8 |
| 4 | 44 |
| 5 | 150 |
| 6 | 540 |
| 7 | 2042 |
| 8 | 7760 |
| 9 | 29654 |
| 10 | 114336 |
| 11 | 442152 |
| 12 | 1713832 |
| 13 | 6655764 |
| 14 | 25893236 |
| 15 | 100873154 |
| 16 | 393455752 |
| 17 | 1536357188 |
| 18 | 6005069488 |
| 19 | 23492496948 |
| 20 | 91979426392 |
| 21 | 360391230046 |
| 22 | 1413045432264 |
| 23 | 5543910852492 |
| 24 | 21763924972776 |
| 25 | 85487754197390 |