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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1013 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 5884965 |
| 10 | 65165529 |
| 11 | 1 |
| 12 | 103888408793 |
| 13 | 474639880182 |
| 14 | 4112907695371 |
| 15 | 72685811469476 |
| 16 | 5155089749987738 |
| 17 | 440411515280180314 |
| 18 | 1 |
| 19 | 95591506202441271281 |
| 20 | 69291880649932219827 |