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 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 35 |
| 4 | 120 |
| 5 | 392 |
| 6 | 1336 |
| 7 | 4725 |
| 8 | 16792 |
| 9 | 59191 |
| 10 | 207536 |
| 11 | 727440 |
| 12 | 2553264 |
| 13 | 8968569 |
| 14 | 31502248 |
| 15 | 110627195 |
| 16 | 388451624 |
| 17 | 1364010648 |
| 18 | 4789766120 |
| 19 | 16819647565 |
| 20 | 59063332152 |
| 21 | 207403715119 |
| 22 | 728306773600 |
| 23 | 2557481457440 |
| 24 | 8980717116000 |
| 25 | 31536219644721 |
| 26 | 110740934436168 |