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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 27 |
| 6 | 80 |
| 7 | 238 |
| 8 | 751 |
| 9 | 2374 |
| 10 | 7608 |
| 11 | 24371 |
| 12 | 78341 |
| 13 | 251269 |
| 14 | 804594 |
| 15 | 2565683 |
| 16 | 8140581 |
| 17 | 25650546 |
| 18 | 80113477 |
| 19 | 247328763 |
| 20 | 752292342 |
| 21 | 2245589193 |
| 22 | 6549404314 |
| 23 | 18573169874 |
| 24 | 50940335705 |
| 25 | 134325417269 |