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 | 2 |
| 3 | 6 |
| 4 | 19 |
| 5 | 64 |
| 6 | 219 |
| 7 | 777 |
| 8 | 2803 |
| 9 | 10315 |
| 10 | 38496 |
| 11 | 145516 |
| 12 | 555764 |
| 13 | 2142060 |
| 14 | 8320207 |
| 15 | 32538518 |
| 16 | 128012533 |
| 17 | 506300507 |
| 18 | 2011932479 |
| 19 | 8028941336 |
| 20 | 32163411045 |
| 21 | 129291553211 |
| 22 | 521372223648 |
| 23 | 2108522273338 |
| 24 | 8549844313915 |
| 25 | 34753397386201 |
| 26 | 141584261960345 |