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 | 1 |
| 14 | 6 |
| 15 | 36 |
| 16 | 199 |
| 17 | 984 |
| 18 | 4433 |
| 19 | 18257 |
| 20 | 69390 |
| 21 | 245105 |
| 22 | 810418 |
| 23 | 2522646 |
| 24 | 7432876 |
| 25 | 20825678 |
| 26 | 55717629 |
| 27 | 142862730 |
| 28 | 352212459 |
| 29 | 837368658 |
| 30 | 1924861589 |
| 31 | 4288250970 |
| 32 | 9278750495 |
| 33 | 19537503288 |
| 34 | 40103712085 |
| 35 | 80377128541 |