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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 2 |
| 10 | 4 |
| 11 | 8 |
| 12 | 15 |
| 13 | 30 |
| 14 | 60 |
| 15 | 120 |
| 16 | 240 |
| 17 | 479 |
| 18 | 956 |
| 19 | 1908 |
| 20 | 3808 |
| 21 | 7601 |
| 22 | 15172 |
| 23 | 30284 |
| 24 | 60448 |
| 25 | 120656 |
| 26 | 240833 |
| 27 | 480710 |
| 28 | 959512 |
| 29 | 1915216 |
| 30 | 3822831 |
| 31 | 7630490 |
| 32 | 15230696 |
| 33 | 30400944 |
| 34 | 60681232 |
| 35 | 121121631 |
| 36 | 241762552 |
| 37 | 482565592 |
| 38 | 963215968 |
| 39 | 1922609105 |