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 | 22 |
| 2 | 104 |
| 3 | 388 |
| 4 | 1692 |
| 5 | 7432 |
| 6 | 33494 |
| 7 | 152818 |
| 8 | 704692 |
| 9 | 3275272 |
| 10 | 15320514 |
| 11 | 72038098 |
| 12 | 340204434 |
| 13 | 1612559698 |
| 14 | 7667644032 |
| 15 | 36559128748 |
| 16 | 174730634628 |
| 17 | 836872304392 |
| 18 | 4015726470338 |
| 19 | 19301794774522 |
| 20 | 92915156135782 |
| 21 | 447886264698862 |