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 | 3 |
| 1 | 8 |
| 2 | 24 |
| 3 | 80 |
| 4 | 288 |
| 5 | 1088 |
| 6 | 4224 |
| 7 | 16640 |
| 8 | 66048 |
| 9 | 263168 |
| 10 | 1050624 |
| 11 | 4198400 |
| 12 | 16785408 |
| 13 | 67125248 |
| 14 | 268468224 |
| 15 | 1073807360 |
| 16 | 4295098368 |
| 17 | 17180131328 |
| 18 | 68720001024 |
| 19 | 274878955520 |
| 20 | 1099513724928 |
| 21 | 4398050705408 |
| 22 | 17592194433024 |
| 23 | 70368760954880 |
| 24 | 281475010265088 |
| 25 | 1125899973951488 |