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 | 1 |
| 1 | 7 |
| 2 | 55 |
| 3 | 481 |
| 4 | 4645 |
| 5 | 49171 |
| 6 | 566827 |
| 7 | 7073725 |
| 8 | 95064361 |
| 9 | 1369375615 |
| 10 | 21054430591 |
| 11 | 344231563897 |
| 12 | 5964569413645 |
| 13 | 109196040092491 |
| 14 | 2106381399472435 |
| 15 | 42705264827626261 |
| 16 | 907920105215691217 |
| 17 | 20198878182718877815 |