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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 8 |
| 4 | 42 |
| 5 | 172 |
| 6 | 611 |
| 7 | 2004 |
| 8 | 6292 |
| 9 | 19304 |
| 10 | 58533 |
| 11 | 176464 |
| 12 | 530558 |
| 13 | 1593204 |
| 14 | 4781575 |
| 15 | 14347196 |
| 16 | 43044648 |
| 17 | 129137680 |
| 18 | 387417545 |
| 19 | 1162258008 |
| 20 | 3486780370 |
| 21 | 10460348540 |
| 22 | 31381054251 |
| 23 | 94143172708 |
| 24 | 282429529532 |
| 25 | 847288601592 |
| 26 | 2541865819501 |
| 27 | 7625597475104 |
| 28 | 22876792443942 |
| 29 | 68630377352644 |
| 30 | 205891132081103 |