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 | 2 |
| 2 | 4 |
| 3 | 13 |
| 4 | 85 |
| 5 | 925 |
| 6 | 16633 |
| 7 | 482329 |
| 8 | 22669417 |
| 9 | 1722875617 |
| 10 | 211913700769 |
| 11 | 42170826452833 |
| 12 | 13579006117811905 |
| 13 | 7074662187380001985 |
| 14 | 5963940223961341672513 |
| 15 | 8134814465483270041306369 |