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 | 15 |
| 3 | 334 |
| 4 | 18521 |
| 5 | 2293896 |
| 6 | 586774783 |
| 7 | 292184148320 |
| 8 | 270280183791969 |
| 9 | 447043237292379520 |
| 10 | 1280479639717884356831 |
| 11 | 6180626271969237488205312 |