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 | 2 |
| 1 | 1 |
| 2 | 6 |
| 3 | 4 |
| 4 | 24 |
| 5 | 22 |
| 6 | 20 |
| 7 | 4020 |
| 8 | 4280 |
| 9 | 22198 |
| 10 | 22194 |
| 11 | 22200 |
| 12 | 31400 |
| 13 | 360652 |
| 14 | 360648 |
| 15 | 370260 |
| 16 | 604062 |
| 17 | 604060 |
| 18 | 1357203 |
| 19 | 2010734 |
| 20 | 4652359 |
| 21 | 4652354 |
| 22 | 4652352 |
| 23 | 17051708 |
| 24 | 20831337 |
| 25 | 20831329 |
| 26 | 20831324 |
| 27 | 47326699 |
| 28 | 47326692 |
| 29 | 123346278 |
| 30 | 256526120 |
| 31 | 428045488 |
| 32 | 436273045 |