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 | 24 |
| 3 | 121 |
| 4 | 653 |
| 5 | 3764 |
| 6 | 22155 |
| 7 | 127375 |
| 8 | 721134 |
| 9 | 4201419 |
| 10 | 25338485 |
| 11 | 153827211 |
| 12 | 920423497 |
| 13 | 5427375260 |
| 14 | 32034890790 |
| 15 | 192848262264 |
| 16 | 1192406909119 |
| 17 | 7468582235924 |
| 18 | 46184458084732 |
| 19 | 277578788510692 |
| 20 | 1635584886442562 |