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 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 175 |
| 4 | 2735 |
| 5 | 49610 |
| 6 | 1029386 |
| 7 | 24088590 |
| 8 | 628068366 |
| 9 | 18061990371 |
| 10 | 568061990371 |
| 11 | 19398632250697 |
| 12 | 714854467214665 |
| 13 | 28276489167109688 |
| 14 | 1195037205850701368 |
| 15 | 53742304051553826368 |
| 16 | 2562499498076052846144 |