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 | 3 |
| 1 | 549 |
| 2 | 14065 |
| 3 | 140483 |
| 4 | 837340 |
| 5 | 3600407 |
| 6 | 12357363 |
| 7 | 35963453 |
| 8 | 92274470 |
| 9 | 100802806 |
| 10 | 232119952 |
| 11 | 493998138 |
| 12 | 984973268 |
| 13 | 1859138937 |
| 14 | 3348839878 |
| 15 | 5793714089 |
| 16 | 9677172654 |
| 17 | 15671492689 |
| 18 | 24692785296 |
| 19 | 25805518236 |
| 20 | 39586883307 |