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 | 3 |
| 2 | 280 |
| 3 | 17300 |
| 4 | 1075397 |
| 5 | 68846551 |
| 6 | 4263997124 |
| 7 | 267855152858 |
| 8 | 16785795917908 |
| 9 | 1051116421516975 |
| 10 | 65871551452359237 |
| 11 | 4126577980480405170 |
| 12 | 258538236543240798654 |
| 13 | 16197912784372244064693 |
| 14 | 1014813990592495583029006 |
| 15 | 63579642939479330198729573 |
| 16 | 3983348112669764700919476270 |