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 | 5 |
| 4 | 13 |
| 5 | 36 |
| 6 | 105 |
| 7 | 320 |
| 8 | 1011 |
| 9 | 3289 |
| 10 | 10957 |
| 11 | 37216 |
| 12 | 128435 |
| 13 | 449142 |
| 14 | 1588228 |
| 15 | 5669505 |
| 16 | 20403322 |
| 17 | 73945553 |
| 18 | 269647630 |
| 19 | 988642372 |
| 20 | 3642310793 |
| 21 | 13476857235 |
| 22 | 50059454347 |
| 23 | 186598634398 |
| 24 | 697777187275 |
| 25 | 2616919372356 |
| 26 | 9840647362248 |