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 | 7 |
| 1 | 15 |
| 2 | 217 |
| 3 | 449 |
| 4 | 6503 |
| 5 | 13455 |
| 6 | 194873 |
| 7 | 403201 |
| 8 | 5839687 |
| 9 | 12082575 |
| 10 | 174995737 |
| 11 | 362074049 |
| 12 | 5244032423 |
| 13 | 10850138895 |
| 14 | 157145976953 |
| 15 | 325142092801 |
| 16 | 4709135276167 |
| 17 | 9743412645135 |
| 18 | 141116912308057 |
| 19 | 291977237261249 |
| 20 | 4228798233965543 |
| 21 | 8749573705192335 |
| 22 | 126722830106658233 |