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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 37 |
| 7 | 116 |
| 8 | 412 |
| 9 | 1526 |
| 10 | 5995 |
| 11 | 24284 |
| 12 | 101619 |
| 13 | 434402 |
| 14 | 1893983 |
| 15 | 8385952 |
| 16 | 37637803 |
| 17 | 170871486 |
| 18 | 783611214 |
| 19 | 3625508762 |
| 20 | 16906577279 |
| 21 | 79395295122 |
| 22 | 375217952457 |
| 23 | 1783447124452 |
| 24 | 8521191260092 |
| 25 | 40907997006020 |
| 26 | 197248252895597 |
| 27 | 954915026282162 |