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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 24 |
| 3 | 112 |
| 4 | 512 |
| 5 | 2304 |
| 6 | 10240 |
| 7 | 45056 |
| 8 | 196608 |
| 9 | 851968 |
| 10 | 3670016 |
| 11 | 15728640 |
| 12 | 67108864 |
| 13 | 285212672 |
| 14 | 1207959552 |
| 15 | 5100273664 |
| 16 | 21474836480 |
| 17 | 90194313216 |
| 18 | 377957122048 |
| 19 | 1580547964928 |
| 20 | 6597069766656 |
| 21 | 27487790694400 |
| 22 | 114349209288704 |
| 23 | 474989023199232 |
| 24 | 1970324836974592 |
| 25 | 8162774324609024 |