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 | 7 |
| 4 | 61 |
| 5 | 121 |
| 6 | 3721 |
| 7 | 5041 |
| 8 | 240241 |
| 9 | 2056321 |
| 10 | 23768641 |
| 11 | 39916801 |
| 12 | 11104853761 |
| 13 | 6227020801 |
| 14 | 683519316481 |
| 15 | 32048919302401 |
| 16 | 577844178912001 |
| 17 | 355687428096001 |
| 18 | 261396772808371201 |
| 19 | 121645100408832001 |
| 20 | 202418558674082150401 |
| 21 | 2061884451929702400001 |
| 22 | 12935940353987812761601 |