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 | 1 |
| 3 | 7 |
| 4 | 97 |
| 5 | 2035 |
| 6 | 57445 |
| 7 | 2042215 |
| 8 | 87651865 |
| 9 | 4410770875 |
| 10 | 254705483725 |
| 11 | 16603869256975 |
| 12 | 1206175463317825 |
| 13 | 96627476254984675 |
| 14 | 8463175473211383925 |
| 15 | 804573717383525464375 |
| 16 | 82513390092813146091625 |
| 17 | 9080444173122231239204875 |
| 18 | 1067360792025339122846660125 |
| 19 | 133468583774114314367364097375 |