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 | 2 |
| 2 | 8 |
| 3 | 24 |
| 4 | 96 |
| 5 | 320 |
| 6 | 1280 |
| 7 | 4480 |
| 8 | 17920 |
| 9 | 64512 |
| 10 | 258048 |
| 11 | 946176 |
| 12 | 3784704 |
| 13 | 14057472 |
| 14 | 56229888 |
| 15 | 210862080 |
| 16 | 843448320 |
| 17 | 3186360320 |
| 18 | 12745441280 |
| 19 | 48432676864 |
| 20 | 193730707456 |
| 21 | 739699064832 |
| 22 | 2958796259328 |
| 23 | 11342052327424 |