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 | 7 |
| 2 | 27 |
| 3 | 99 |
| 4 | 413 |
| 5 | 1601 |
| 6 | 6349 |
| 7 | 25153 |
| 8 | 99287 |
| 9 | 392907 |
| 10 | 1553391 |
| 11 | 6142251 |
| 12 | 24289277 |
| 13 | 96042921 |
| 14 | 379779797 |
| 15 | 1501741049 |
| 16 | 5938235583 |
| 17 | 23481235283 |
| 18 | 92850420759 |
| 19 | 367152906387 |
| 20 | 1451810964181 |
| 21 | 5740809545409 |
| 22 | 22700542022605 |
| 23 | 89763402870129 |