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 | 4 |
| 3 | 7 |
| 4 | 9 |
| 5 | 2 |
| 6 | -34 |
| 7 | -130 |
| 8 | -284 |
| 9 | -284 |
| 10 | 730 |
| 11 | 4864 |
| 12 | 14860 |
| 13 | 27134 |
| 14 | 6462 |
| 15 | -170865 |
| 16 | -771303 |
| 17 | -2005828 |
| 18 | -2751028 |
| 19 | 3491747 |
| 20 | 36288137 |
| 21 | 130265102 |
| 22 | 283131062 |
| 23 | 210905402 |
| 24 | -1317613954 |
| 25 | -7461822262 |
| 26 | -22297519418 |
| 27 | -38398674146 |
| 28 | 10151248222 |
| 29 | 355843715494 |
| 30 | 1495838414326 |