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) |
|---|---|
| 13 | 14 |
| 14 | 225 |
| 15 | 1920 |
| 16 | 11560 |
| 17 | 55080 |
| 18 | 220932 |
| 19 | 775200 |
| 20 | 2441880 |
| 21 | 7034940 |
| 22 | 18795370 |
| 23 | 47070144 |
| 24 | 111435000 |
| 25 | 251100200 |
| 26 | 541574100 |
| 27 | 1123264800 |
| 28 | 2249204040 |
| 29 | 4362680250 |
| 30 | 8220658275 |
| 31 | 15085939200 |
| 32 | 27020703600 |
| 33 | 47327171760 |
| 34 | 81198579000 |
| 35 | 136666699200 |
| 36 | 225962211600 |
| 37 | 367443055800 |