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 | 0 |
| 1 | 1 |
| 2 | 17 |
| 3 | 125 |
| 4 | 637 |
| 5 | 2637 |
| 6 | 9549 |
| 7 | 31501 |
| 8 | 97037 |
| 9 | 283661 |
| 10 | 795661 |
| 11 | 2158605 |
| 12 | 5697549 |
| 13 | 14696461 |
| 14 | 37175309 |
| 15 | 92471309 |
| 16 | 226689037 |
| 17 | 548667405 |
| 18 | 1313079309 |
| 19 | 3111125005 |
| 20 | 7305429005 |
| 21 | 17016291341 |
| 22 | 39346765837 |
| 23 | 90378862605 |
| 24 | 206342979597 |
| 25 | 468486979597 |
| 26 | 1058239676429 |