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 | 43 |
| 4 | 268 |
| 5 | 1824 |
| 6 | 13156 |
| 7 | 98865 |
| 8 | 765948 |
| 9 | 6075256 |
| 10 | 49094708 |
| 11 | 402801425 |
| 12 | 3346590068 |
| 13 | 28099903160 |
| 14 | 238079915640 |
| 15 | 2032914717645 |
| 16 | 17476713955548 |
| 17 | 151143219598008 |
| 18 | 1314045772469632 |
| 19 | 11478299163026540 |
| 20 | 100688538612524720 |
| 21 | 886622619082002120 |
| 22 | 7834289222109530340 |