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 | 7 |
| 2 | 19 |
| 3 | 41 |
| 4 | 199 |
| 5 | 919 |
| 6 | 5741 |
| 7 | 18089 |
| 8 | 41651 |
| 9 | 90271 |
| 10 | 446081 |
| 11 | 1276001 |
| 12 | 27033161 |
| 13 | 43220449 |
| 14 | 53308529 |
| 15 | 109245401 |
| 16 | 512669249 |
| 17 | 663929729 |
| 18 | 2266639649 |
| 19 | 2560742911 |
| 20 | 2969200961 |
| 21 | 8505402751 |
| 22 | 32540473601 |
| 23 | 61573368401 |
| 24 | 74335064959 |
| 25 | 109494811999 |