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 | 2 |
| 3 | 7 |
| 4 | 26 |
| 5 | 95 |
| 6 | 353 |
| 7 | 1387 |
| 8 | 5699 |
| 9 | 23592 |
| 10 | 99020 |
| 11 | 415796 |
| 12 | 1748722 |
| 13 | 7336978 |
| 14 | 30741661 |
| 15 | 128510698 |
| 16 | 536268877 |
| 17 | 2233642396 |
| 18 | 9288889882 |