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 | 1 |
| 2 | 11 |
| 3 | 85 |
| 4 | 583 |
| 5 | 3785 |
| 6 | 23843 |
| 7 | 147437 |
| 8 | 900559 |
| 9 | 5453457 |
| 10 | 32816315 |
| 11 | 196531781 |
| 12 | 1172634391 |
| 13 | 6976059865 |
| 14 | 41401814099 |
| 15 | 245230349021 |
| 16 | 1450162049695 |
| 17 | 8563622372129 |
| 18 | 50510963880299 |
| 19 | 297627067200821 |
| 20 | 1752169739791591 |
| 21 | 10307304302433513 |
| 22 | 60592569330907523 |