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 | 5 |
| 2 | 40 |
| 3 | 510 |
| 4 | 9095 |
| 5 | 203376 |
| 6 | 5323465 |
| 7 | 156499485 |
| 8 | 5035901400 |
| 9 | 174413579095 |
| 10 | 6427089519606 |
| 11 | 249922852038280 |
| 12 | 10193367893772075 |
| 13 | 434056833951578950 |
| 14 | 19227980415244742745 |
| 15 | 883565304511733011301 |
| 16 | 42019895809388715550450 |