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 | 28 |
| 2 | 698 |
| 3 | 16449 |
| 4 | 394509 |
| 5 | 9340070 |
| 6 | 222457036 |
| 7 | 5277728354 |
| 8 | 125489197292 |
| 9 | 2979675864286 |
| 10 | 70809806218933 |
| 11 | 1681881988746468 |
| 12 | 39960823740980549 |
| 13 | 949269180927265463 |
| 14 | 22552572727646416085 |
| 15 | 535760871479260663596 |