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 | 4 |
| 3 | 26 |
| 4 | 255 |
| 5 | 3642 |
| 6 | 75606 |
| 7 | 2316169 |
| 8 | 106289210 |
| 9 | 7321773414 |
| 10 | 748425136289 |
| 11 | 111576624613588 |
| 12 | 23864968806932886 |
| 13 | 7225895692327786931 |
| 14 | 3064182503223082011556 |
| 15 | 1803904252801640389374494 |
| 16 | 1463405916763710662849541695 |
| 17 | 1625522872429294851288338156654 |