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 | 8 |
| 2 | 36 |
| 3 | 154 |
| 4 | 638 |
| 5 | 2583 |
| 6 | 10283 |
| 7 | 40437 |
| 8 | 157577 |
| 9 | 609826 |
| 10 | 2347039 |
| 11 | 8992543 |
| 12 | 34325682 |
| 13 | 130610876 |
| 14 | 495631814 |
| 15 | 1876372121 |
| 16 | 7089015135 |
| 17 | 26734090034 |
| 18 | 100657714409 |
| 19 | 378448861732 |
| 20 | 1421055725676 |
| 21 | 5329855712676 |
| 22 | 19969617365137 |
| 23 | 74751054819223 |