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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 66 |
| 6 | 199 |
| 7 | 601 |
| 8 | 1861 |
| 9 | 5815 |
| 10 | 18396 |
| 11 | 58684 |
| 12 | 188764 |
| 13 | 611103 |
| 14 | 1990361 |
| 15 | 6515786 |
| 16 | 21429510 |
| 17 | 70767468 |
| 18 | 234565319 |
| 19 | 780086526 |
| 20 | 2602209961 |
| 21 | 8704547698 |
| 22 | 29191435328 |
| 23 | 98125474137 |
| 24 | 330558122499 |
| 25 | 1115795428615 |
| 26 | 3773380090126 |
| 27 | 12782934685768 |
| 28 | 43374552366876 |