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 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 68 |
| 4 | 392 |
| 5 | 2064 |
| 6 | 10272 |
| 7 | 49216 |
| 8 | 229504 |
| 9 | 1048832 |
| 10 | 4719104 |
| 11 | 20972544 |
| 12 | 92276736 |
| 13 | 402657280 |
| 14 | 1744838656 |
| 15 | 7516209152 |
| 16 | 32212287488 |
| 17 | 137439019008 |
| 18 | 584115683328 |
| 19 | 2473901424640 |
| 20 | 10445360988160 |
| 21 | 43980466159616 |
| 22 | 184717955563520 |
| 23 | 774056190148608 |
| 24 | 3236962240561152 |