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 | 1 |
| 3 | 8 |
| 4 | 15 |
| 5 | 71 |
| 6 | 176 |
| 7 | 673 |
| 8 | 1905 |
| 9 | 6616 |
| 10 | 19951 |
| 11 | 66263 |
| 12 | 205920 |
| 13 | 669761 |
| 14 | 2111201 |
| 15 | 6799528 |
| 16 | 21577935 |
| 17 | 69174631 |
| 18 | 220220176 |
| 19 | 704442593 |
| 20 | 2245983825 |
| 21 | 7177081976 |
| 22 | 22898968751 |
| 23 | 73138542583 |
| 24 | 233431323840 |
| 25 | 745401121921 |
| 26 | 2379420388801 |