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 | 4 |
| 3 | 6 |
| 4 | 169 |
| 5 | 2622 |
| 6 | 137641 |
| 7 | 11458758 |
| 8 | 1944369025 |
| 9 | 692690245830 |
| 10 | 490393052832400 |
| 11 | 695395811259688914 |
| 12 | 1963720302048546357904 |
| 13 | 11300709997961358290597645 |
| 14 | 129580789221471473285725965124 |
| 15 | 2990581397819168926985646623641461 |