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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 28 |
| 5 | 88 |
| 6 | 208 |
| 7 | 544 |
| 8 | 1216 |
| 9 | 2944 |
| 10 | 7424 |
| 11 | 15872 |
| 12 | 37888 |
| 13 | 83968 |
| 14 | 176128 |
| 15 | 385024 |
| 16 | 868352 |
| 17 | 1933312 |
| 18 | 3997696 |
| 19 | 8781824 |
| 20 | 18612224 |
| 21 | 38273024 |
| 22 | 82837504 |
| 23 | 174063616 |
| 24 | 373293056 |
| 25 | 813694976 |
| 26 | 1694498816 |
| 27 | 3456106496 |
| 28 | 7180648448 |
| 29 | 14629732352 |
| 30 | 30333206528 |