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 | 2 |
| 2 | 6 |
| 3 | 15 |
| 4 | 35 |
| 5 | 77 |
| 6 | 165 |
| 7 | 330 |
| 8 | 660 |
| 9 | 1260 |
| 10 | 2352 |
| 11 | 4312 |
| 12 | 7777 |
| 13 | 13635 |
| 14 | 23760 |
| 15 | 40656 |
| 16 | 68607 |
| 17 | 114345 |
| 18 | 188650 |
| 19 | 307230 |
| 20 | 496584 |
| 21 | 793584 |
| 22 | 1257510 |
| 23 | 1976625 |
| 24 | 3083850 |
| 25 | 4769688 |
| 26 | 7332360 |
| 27 | 11191180 |
| 28 | 16972670 |
| 29 | 25582260 |
| 30 | 38342568 |
| 31 | 57123858 |
| 32 | 84683907 |