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 | 7 |
| 3 | 41 |
| 4 | 398 |
| 5 | 6177 |
| 6 | 128232 |
| 7 | 2881531 |
| 8 | 62769238 |
| 9 | 1288737197 |
| 10 | 25012685732 |
| 11 | 463681018671 |
| 12 | 8294783320578 |
| 13 | 144410750517217 |
| 14 | 2462999084589232 |
| 15 | 41359616334934211 |
| 16 | 686406989350511918 |
| 17 | 11290725888842193237 |