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 | 22 |
| 3 | 11572 |
| 4 | 265651 |
| 5 | 139997551 |
| 6 | 3213845272 |
| 7 | 1693690359922 |
| 8 | 38881099834501 |
| 9 | 20490265834338301 |
| 10 | 470383542583947322 |
| 11 | 247891234370134405072 |
| 12 | 5690700059299494866551 |
| 13 | 2998988132919620198222251 |
| 14 | 68846088847021746311586172 |
| 15 | 36281758184170330787958387022 |