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) |
|---|---|
| 7 | 1 |
| 8 | 4 |
| 9 | 21 |
| 10 | 72 |
| 11 | 271 |
| 12 | 858 |
| 13 | 2846 |
| 14 | 8632 |
| 15 | 26913 |
| 16 | 79504 |
| 17 | 238881 |
| 18 | 693210 |
| 19 | 2033133 |
| 20 | 5823100 |
| 21 | 16794540 |
| 22 | 47619222 |
| 23 | 135663289 |
| 24 | 381615476 |
| 25 | 1077064799 |
| 26 | 3010363236 |
| 27 | 8434161574 |
| 28 | 23448994128 |