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 | 0 |
| 2 | 1 |
| 3 | 90 |
| 4 | 13690 |
| 5 | 3443275 |
| 6 | 1308315371 |
| 7 | 701623884514 |
| 8 | 505274768721332 |
| 9 | 470638793249281593 |
| 10 | 550707386335951810915 |
| 11 | 790898932162231992184327 |
| 12 | 1367864138835420575101044139 |
| 13 | 2804370191530797723173615407860 |
| 14 | 6725366044028696102055907486691290 |