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 | 2 |
| 3 | 8 |
| 4 | 26 |
| 5 | 127 |
| 6 | 478 |
| 7 | 2536 |
| 8 | 10250 |
| 9 | 56900 |
| 10 | 239880 |
| 11 | 1370272 |
| 12 | 5940054 |
| 13 | 34607146 |
| 14 | 153018932 |
| 15 | 904441648 |
| 16 | 4058644842 |
| 17 | 24254529036 |
| 18 | 110096276440 |
| 19 | 663665021280 |
| 20 | 3040205250984 |
| 21 | 18455364854839 |
| 22 | 85176971647470 |
| 23 | 520059936017128 |