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 | 3 |
| 1 | 8 |
| 2 | 25 |
| 3 | 84 |
| 4 | 294 |
| 5 | 1056 |
| 6 | 3861 |
| 7 | 14300 |
| 8 | 53482 |
| 9 | 201552 |
| 10 | 764218 |
| 11 | 2912168 |
| 12 | 11143500 |
| 13 | 42791040 |
| 14 | 164812365 |
| 15 | 636438060 |
| 16 | 2463251010 |
| 17 | 9552774000 |
| 18 | 37112526990 |
| 19 | 144410649240 |
| 20 | 562724141460 |
| 21 | 2195581527360 |
| 22 | 8576490341250 |
| 23 | 33537507830424 |