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) |
|---|---|
| 10 | 1 |
| 11 | 9 |
| 12 | 65 |
| 13 | 378 |
| 14 | 1867 |
| 15 | 8056 |
| 16 | 31061 |
| 17 | 108692 |
| 18 | 349703 |
| 19 | 1044990 |
| 20 | 2924863 |
| 21 | 7722047 |
| 22 | 19346165 |
| 23 | 46229029 |
| 24 | 105831924 |
| 25 | 233008811 |
| 26 | 495046641 |
| 27 | 1017948120 |
| 28 | 2031186319 |
| 29 | 3942115307 |
| 30 | 7457028087 |
| 31 | 13774178034 |
| 32 | 24885909121 |
| 33 | 44043512380 |