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) |
|---|---|
| 1 | 1 |
| 2 | 61 |
| 3 | 803 |
| 4 | 3988 |
| 5 | 74989 |
| 6 | 484820 |
| 7 | 4586834 |
| 8 | 36563811 |
| 9 | 772030917 |
| 10 | 9805762862 |
| 11 | 13544862270 |
| 12 | 526046281890 |
| 13 | 2449707207204 |
| 14 | 18939113748475 |
| 15 | 408807538689175 |
| 16 | 2126633862223536 |
| 17 | 93179318006076672 |
| 18 | 635443338908659593 |