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 | 1 |
| 1 | 7 |
| 2 | 29 |
| 3 | 123 |
| 4 | 425 |
| 5 | 1343 |
| 6 | 4197 |
| 7 | 12435 |
| 8 | 33809 |
| 9 | 84663 |
| 10 | 198765 |
| 11 | 444907 |
| 12 | 959801 |
| 13 | 2005615 |
| 14 | 4064821 |
| 15 | 7988867 |
| 16 | 15221537 |
| 17 | 28122727 |
| 18 | 50423741 |
| 19 | 87851099 |
| 20 | 148962249 |
| 21 | 246243487 |
| 22 | 397527813 |
| 23 | 627798387 |
| 24 | 971451697 |
| 25 | 1475103511 |
| 26 | 2201030157 |