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 | 3 |
| 3 | 9 |
| 4 | 25 |
| 5 | 66 |
| 6 | 165 |
| 7 | 402 |
| 8 | 943 |
| 9 | 2163 |
| 10 | 4835 |
| 11 | 10598 |
| 12 | 22785 |
| 13 | 48215 |
| 14 | 100470 |
| 15 | 206620 |
| 16 | 419662 |
| 17 | 842928 |
| 18 | 1675487 |
| 19 | 3298688 |
| 20 | 6436210 |
| 21 | 12453352 |
| 22 | 23905923 |
| 23 | 45550529 |
| 24 | 86180937 |
| 25 | 161964145 |
| 26 | 302447657 |