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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 21 |
| 5 | 48 |
| 6 | 108 |
| 7 | 240 |
| 8 | 528 |
| 9 | 1152 |
| 10 | 2496 |
| 11 | 5376 |
| 12 | 11520 |
| 13 | 24576 |
| 14 | 52224 |
| 15 | 110592 |
| 16 | 233472 |
| 17 | 491520 |
| 18 | 1032192 |
| 19 | 2162688 |
| 20 | 4521984 |
| 21 | 9437184 |
| 22 | 19660800 |
| 23 | 40894464 |
| 24 | 84934656 |
| 25 | 176160768 |
| 26 | 364904448 |
| 27 | 754974720 |
| 28 | 1560281088 |
| 29 | 3221225472 |