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 | 66 |
| 12 | 1582 |
| 13 | 21895 |
| 14 | 215849 |
| 15 | 1685957 |
| 16 | 11051141 |
| 17 | 63115364 |
| 18 | 322683730 |
| 19 | 1503863212 |
| 20 | 6488505684 |
| 21 | 26177296409 |
| 22 | 99733640537 |
| 23 | 361023920432 |
| 24 | 1250117445742 |
| 25 | 4157235614630 |
| 26 | 13341716405949 |
| 27 | 41433896651428 |
| 28 | 124970671492315 |
| 29 | 366791960890982 |
| 30 | 1050487889623924 |