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) |
|---|---|
| 9 | 1 |
| 10 | 1 |
| 11 | 6 |
| 12 | 18 |
| 13 | 73 |
| 14 | 240 |
| 15 | 841 |
| 16 | 2714 |
| 17 | 8758 |
| 18 | 27259 |
| 19 | 83847 |
| 20 | 252929 |
| 21 | 754737 |
| 22 | 2225129 |
| 23 | 6505344 |
| 24 | 18867696 |
| 25 | 54384446 |
| 26 | 155892016 |
| 27 | 444839696 |
| 28 | 1264336132 |
| 29 | 3581584336 |
| 30 | 10116577962 |
| 31 | 28505061687 |
| 32 | 80146304124 |
| 33 | 224929999040 |
| 34 | 630259883854 |
| 35 | 1763574118096 |
| 36 | 4928881367449 |