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 | 12 |
| 2 | 144 |
| 3 | 396 |
| 4 | 1719 |
| 5 | 6123 |
| 6 | 16038 |
| 7 | 49925 |
| 8 | 129302 |
| 9 | 329498 |
| 10 | 836938 |
| 11 | 1984447 |
| 12 | 4716834 |
| 13 | 10888212 |
| 14 | 24623818 |
| 15 | 55173270 |
| 16 | 121321500 |
| 17 | 264139722 |
| 18 | 568757951 |
| 19 | 1211623656 |
| 20 | 2560468834 |
| 21 | 5364327387 |
| 22 | 11156813446 |
| 23 | 23048288350 |
| 24 | 47308658140 |
| 25 | 96551671749 |