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 | 3 |
| 3 | 4 |
| 4 | 13 |
| 5 | 28 |
| 6 | 71 |
| 7 | 168 |
| 8 | 409 |
| 9 | 984 |
| 10 | 2379 |
| 11 | 5740 |
| 12 | 13861 |
| 13 | 33460 |
| 14 | 80783 |
| 15 | 195024 |
| 16 | 470833 |
| 17 | 1136688 |
| 18 | 2744211 |
| 19 | 6625108 |
| 20 | 15994429 |
| 21 | 38613964 |
| 22 | 93222359 |
| 23 | 225058680 |
| 24 | 543339721 |
| 25 | 1311738120 |
| 26 | 3166815963 |
| 27 | 7645370044 |
| 28 | 18457556053 |
| 29 | 44560482148 |
| 30 | 107578520351 |