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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 12 |
| 6 | 24 |
| 7 | 40 |
| 8 | 80 |
| 9 | 160 |
| 10 | 280 |
| 11 | 560 |
| 12 | 1120 |
| 13 | 2240 |
| 14 | 4480 |
| 15 | 10080 |
| 16 | 20160 |
| 17 | 40320 |
| 18 | 88704 |
| 19 | 177408 |
| 20 | 354816 |
| 21 | 768768 |
| 22 | 1537536 |
| 23 | 3075072 |
| 24 | 6589440 |
| 25 | 13178880 |
| 26 | 26357760 |
| 27 | 56010240 |
| 28 | 112020480 |
| 29 | 224040960 |
| 30 | 504092160 |
| 31 | 1064194560 |
| 32 | 2128389120 |
| 33 | 4729753600 |
| 34 | 9932482560 |