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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 44 |
| 4 | 710 |
| 5 | 1420 |
| 6 | 2130 |
| 7 | 2840 |
| 8 | 312689 |
| 9 | 10838702 |
| 10 | 6167950454 |
| 11 | 21053343141 |
| 12 | 63160029423 |
| 13 | 105266715705 |