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 | 1 |
| 4 | 2 |
| 5 | 9 |
| 6 | 37 |
| 7 | 121 |
| 8 | 332 |
| 9 | 808 |
| 10 | 1837 |
| 11 | 4113 |
| 12 | 9497 |
| 13 | 23091 |
| 14 | 58462 |
| 15 | 150129 |
| 16 | 382810 |
| 17 | 960520 |
| 18 | 2373982 |
| 19 | 5816480 |
| 20 | 14230964 |
| 21 | 34948927 |
| 22 | 86295036 |
| 23 | 213973997 |
| 24 | 531470618 |
| 25 | 1319411997 |
| 26 | 3270186871 |
| 27 | 8091796123 |
| 28 | 20002405065 |
| 29 | 49435009494 |
| 30 | 122222402392 |
| 31 | 302354237393 |