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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 44 |
| 8 | 113 |
| 9 | 296 |
| 10 | 782 |
| 11 | 2076 |
| 12 | 5538 |
| 13 | 14856 |
| 14 | 40100 |
| 15 | 108936 |
| 16 | 297793 |
| 17 | 818832 |
| 18 | 2263481 |
| 19 | 6286498 |
| 20 | 17532707 |
| 21 | 49077268 |
| 22 | 137821247 |
| 23 | 388150322 |
| 24 | 1095980561 |
| 25 | 3101840232 |
| 26 | 8797579789 |
| 27 | 25001305410 |
| 28 | 71179961918 |
| 29 | 203000438544 |
| 30 | 579876376729 |
| 31 | 1658948939262 |