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 | 3 |
| 2 | 15 |
| 3 | 99 |
| 4 | 814 |
| 5 | 8057 |
| 6 | 93627 |
| 7 | 1252752 |
| 8 | 19003467 |
| 9 | 322722064 |
| 10 | 6071897378 |
| 11 | 125464556309 |
| 12 | 2826120900315 |
| 13 | 68954181763586 |
| 14 | 1812280504183309 |
| 15 | 51059994255961903 |
| 16 | 1535575877864707548 |
| 17 | 49107734497585814006 |