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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 19 |
| 5 | 79 |
| 6 | 333 |
| 7 | 1441 |
| 8 | 6351 |
| 9 | 28451 |
| 10 | 129185 |
| 11 | 593373 |
| 12 | 2752427 |
| 13 | 12876343 |
| 14 | 60684533 |
| 15 | 287857209 |
| 16 | 1373286375 |
| 17 | 6584979659 |
| 18 | 31719337353 |
| 19 | 153416338549 |
| 20 | 744777567043 |
| 21 | 3627787084319 |