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) |
|---|---|
| 4 | 6 |
| 5 | 111 |
| 6 | 1100 |
| 7 | 8030 |
| 8 | 48950 |
| 9 | 265625 |
| 10 | 1331540 |
| 11 | 6310976 |
| 12 | 28719094 |
| 13 | 126814819 |
| 14 | 547457452 |
| 15 | 2323131730 |
| 16 | 9729382150 |
| 17 | 40335953245 |
| 18 | 165915269268 |
| 19 | 678306115284 |
| 20 | 2759909133030 |
| 21 | 11187839886855 |
| 22 | 45220188014220 |
| 23 | 182359367356230 |
| 24 | 734088513869846 |
| 25 | 2950950104332001 |
| 26 | 11849511321016340 |
| 27 | 47540932962238760 |