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 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 10 |
| 12 | 55 |
| 13 | 220 |
| 14 | 715 |
| 15 | 2002 |
| 16 | 5005 |
| 17 | 11440 |
| 18 | 24310 |
| 19 | 48620 |
| 20 | 880022 |
| 21 | 8438222 |
| 22 | 56936672 |
| 23 | 303159572 |
| 24 | 1354883102 |
| 25 | 5281317614 |
| 26 | 18427861739 |
| 27 | 58640820239 |
| 28 | 172577535989 |
| 29 | 4529938877492 |
| 30 | 62058701943644 |
| 31 | 590100171030140 |
| 32 | 4371834356234285 |