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 | 4 |
| 2 | 46 |
| 3 | 514 |
| 4 | 5266 |
| 5 | 51274 |
| 6 | 484786 |
| 7 | 4503034 |
| 8 | 41367106 |
| 9 | 377342794 |
| 10 | 3426318226 |
| 11 | 31018262554 |
| 12 | 280252754146 |
| 13 | 2528805134314 |
| 14 | 22798428290866 |
| 15 | 205420947110074 |
| 16 | 1850199078944386 |
| 17 | 16660255040221834 |
| 18 | 149993075340330706 |