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 | 4 |
| 3 | 9 |
| 4 | 17 |
| 5 | 50 |
| 6 | 261 |
| 7 | 1275 |
| 8 | 5028 |
| 9 | 17253 |
| 10 | 58601 |
| 11 | 218042 |
| 12 | 876789 |
| 13 | 3537847 |
| 14 | 13783018 |
| 15 | 52301709 |
| 16 | 198627921 |
| 17 | 767778786 |
| 18 | 3010327497 |
| 19 | 11824753551 |
| 20 | 46200429186 |
| 21 | 179787741723 |
| 22 | 700285942731 |
| 23 | 2738134757118 |
| 24 | 10739885115573 |
| 25 | 42164261091351 |
| 26 | 165467386466802 |