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 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 15 |
| 5 | 30 |
| 6 | 78 |
| 7 | 183 |
| 8 | 567 |
| 9 | 1512 |
| 10 | 5352 |
| 11 | 15747 |
| 12 | 61827 |
| 13 | 196962 |
| 14 | 842082 |
| 15 | 2869107 |
| 16 | 13191027 |
| 17 | 47650452 |
| 18 | 233445012 |
| 19 | 888174087 |
| 20 | 4604065287 |
| 21 | 18353375862 |
| 22 | 100102982262 |
| 23 | 416337125487 |
| 24 | 2378327679087 |
| 25 | 10284181259712 |
| 26 | 61295935653312 |