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 | 5 |
| 2 | 28 |
| 3 | 163 |
| 4 | 1026 |
| 5 | 6814 |
| 6 | 45472 |
| 7 | 297210 |
| 8 | 1936867 |
| 9 | 12941917 |
| 10 | 88456127 |
| 11 | 605472534 |
| 12 | 4098451778 |
| 13 | 27532173631 |
| 14 | 186053199184 |
| 15 | 1280442885415 |
| 16 | 8972454019845 |
| 17 | 63101697125668 |
| 18 | 438054873198566 |
| 19 | 2987530815338138 |
| 20 | 20248691923570271 |