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 | 13 |
| 2 | 37 |
| 3 | 85 |
| 4 | 225 |
| 5 | 593 |
| 6 | 1609 |
| 7 | 4409 |
| 8 | 12217 |
| 9 | 34105 |
| 10 | 95817 |
| 11 | 270569 |
| 12 | 767325 |
| 13 | 2184013 |
| 14 | 6235693 |
| 15 | 17852045 |
| 16 | 51229417 |
| 17 | 147318953 |
| 18 | 424429081 |
| 19 | 1224825209 |
| 20 | 3539918965 |
| 21 | 10244733605 |
| 22 | 29685367573 |
| 23 | 86113604309 |
| 24 | 250061941093 |
| 25 | 726831403493 |