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 | 5 |
| 3 | 23 |
| 4 | 117 |
| 5 | 501 |
| 6 | 2369 |
| 7 | 9525 |
| 8 | 39731 |
| 9 | 145415 |
| 10 | 554487 |
| 11 | 1975561 |
| 12 | 7301317 |
| 13 | 25334269 |