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 | 0 |
| 1 | 1 |
| 2 | 37 |
| 3 | 1172 |
| 4 | 62814 |
| 5 | 5488059 |
| 6 | 710771275 |
| 7 | 127661752406 |
| 8 | 30341995265036 |
| 9 | 9215499383109573 |
| 10 | 3481204991988351553 |
| 11 | 1600596371590399671784 |
| 12 | 880013938000716625811210 |
| 13 | 570091859313674511164175135 |