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 | 4 |
| 3 | 10 |
| 4 | 25 |
| 5 | 58 |
| 6 | 135 |
| 7 | 306 |
| 8 | 690 |
| 9 | 1550 |
| 10 | 3474 |
| 11 | 7776 |
| 12 | 17398 |
| 13 | 38912 |
| 14 | 87022 |
| 15 | 194598 |
| 16 | 435148 |
| 17 | 973034 |
| 18 | 2175785 |