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 | 2 |
| 2 | 8 |
| 3 | 36 |
| 4 | 170 |
| 5 | 824 |
| 6 | 4060 |
| 7 | 20232 |
| 8 | 101664 |
| 9 | 514140 |
| 10 | 2613468 |
| 11 | 13340496 |
| 12 | 68335644 |
| 13 | 351087128 |
| 14 | 1808405600 |
| 15 | 9335697424 |
| 16 | 48289295226 |
| 17 | 250213951992 |
| 18 | 1298517484804 |
| 19 | 6748250144600 |
| 20 | 35114221973600 |
| 21 | 182924946400680 |
| 22 | 953931045159000 |
| 23 | 4979398271047200 |
| 24 | 26014703727203100 |