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 | 17 |
| 3 | 52 |
| 4 | 148 |
| 5 | 400 |
| 6 | 1060 |
| 7 | 2700 |
| 8 | 6720 |
| 9 | 15760 |
| 10 | 36248 |
| 11 | 77856 |
| 12 | 163296 |
| 13 | 312760 |
| 14 | 590536 |
| 15 | 995160 |
| 16 | 1663664 |
| 17 | 2405056 |
| 18 | 3482320 |
| 19 | 4180656 |
| 20 | 5080320 |
| 21 | 4823560 |
| 22 | 4686432 |
| 23 | 3165088 |
| 24 | 2228584 |
| 25 | 792272 |
| 26 | 303264 |
| 27 | 0 |