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 | 24 |
| 2 | 70 |
| 3 | 162 |
| 4 | 434 |
| 5 | 1154 |
| 6 | 3160 |
| 7 | 8732 |
| 8 | 24394 |
| 9 | 68634 |
| 10 | 194300 |
| 11 | 552752 |
| 12 | 1579004 |
| 13 | 4526364 |
| 14 | 13014190 |
| 15 | 37515722 |
| 16 | 108392314 |
| 17 | 313803194 |
| 18 | 910109980 |
| 19 | 2643790592 |
| 20 | 7691092024 |
| 21 | 22403591624 |
| 22 | 65337858370 |
| 23 | 190759113662 |
| 24 | 557493641284 |