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) |
|---|---|
| 1 | 3 |
| 2 | 12 |
| 3 | 50 |
| 4 | 108 |
| 5 | 260 |
| 6 | 542 |
| 7 | 1126 |
| 8 | 2230 |
| 9 | 4336 |
| 10 | 8246 |
| 11 | 15458 |
| 12 | 28608 |
| 13 | 52420 |
| 14 | 95240 |
| 15 | 171814 |
| 16 | 308056 |
| 17 | 549384 |
| 18 | 975130 |
| 19 | 1723482 |
| 20 | 3034498 |
| 21 | 5324180 |
| 22 | 9311762 |
| 23 | 16238070 |