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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 7 |
| 10 | 34 |
| 11 | 136 |
| 12 | 487 |
| 13 | 1615 |
| 14 | 5079 |
| 15 | 15349 |
| 16 | 45009 |
| 17 | 128899 |
| 18 | 362266 |
| 19 | 1002681 |
| 20 | 2740448 |
| 21 | 7411408 |
| 22 | 19865445 |
| 23 | 52840977 |
| 24 | 139624510 |
| 25 | 366803313 |
| 26 | 958696860 |
| 27 | 2494322662 |
| 28 | 6463281890 |
| 29 | 16686206047 |
| 30 | 42935345688 |
| 31 | 110142163940 |
| 32 | 281763465941 |