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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 68 |
| 6 | 207 |
| 7 | 644 |
| 8 | 2040 |
| 9 | 6558 |
| 10 | 21343 |
| 11 | 70186 |
| 12 | 232864 |
| 13 | 778550 |
| 14 | 2620459 |
| 15 | 8872074 |
| 16 | 30195288 |
| 17 | 103246502 |
| 18 | 354508628 |
| 19 | 1221846856 |
| 20 | 4225644866 |
| 21 | 14659644348 |
| 22 | 51002664023 |
| 23 | 177909901566 |
| 24 | 622093882290 |
| 25 | 2180123564130 |
| 26 | 7656055966092 |