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 | 6 |
| 3 | 66 |
| 4 | 781 |
| 5 | 9301 |
| 6 | 110826 |
| 7 | 1320606 |
| 8 | 15736441 |
| 9 | 187516681 |
| 10 | 2234463726 |
| 11 | 26626048026 |
| 12 | 317278112581 |
| 13 | 3780711302941 |
| 14 | 45051257522706 |
| 15 | 536834378969526 |
| 16 | 6396961290111601 |
| 17 | 76226701102369681 |
| 18 | 908323451938324566 |
| 19 | 10823654722157525106 |
| 20 | 128975533213951976701 |