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 | 1 |
| 2 | 7 |
| 3 | 73 |
| 4 | 939 |
| 5 | 13976 |
| 6 | 233241 |
| 7 | 4282895 |
| 8 | 85445683 |
| 9 | 1834958107 |
| 10 | 42110641373 |
| 11 | 1026677317227 |
| 12 | 26462793170760 |
| 13 | 718141884712500 |
| 14 | 20446913056248836 |
| 15 | 608923223179959780 |
| 16 | 18917094810892717955 |
| 17 | 611616504412815339432 |