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 | 0 |
| 2 | 7 |
| 3 | 105 |
| 4 | 2219 |
| 5 | 31087 |
| 6 | 1088129 |
| 7 | 2538991 |
| 8 | 17772957 |
| 9 | 248821433 |
| 10 | 15675750559 |
| 11 | 21946050833 |
| 12 | 1689845914645 |
| 13 | 11828921402977 |
| 14 | 1076431847676451 |
| 15 | 7535022933740305 |
| 16 | 263725802680934699 |
| 17 | 3692161237533130831 |