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 | 4 |
| 2 | 32 |
| 3 | 370 |
| 4 | 5950 |
| 5 | 122984 |
| 6 | 3175696 |
| 7 | 98815588 |
| 8 | 3638940860 |
| 9 | 155377163440 |
| 10 | 7598445388096 |
| 11 | 420034502219864 |
| 12 | 26014375783223272 |
| 13 | 1788772035008337760 |
| 14 | 135644687161742899520 |
| 15 | 11268192704027639350384 |
| 16 | 1020100484786824631520016 |
| 17 | 100126060947226759050509888 |