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 | 1 |
| 5 | 64 |
| 6 | 901 |
| 7 | 6821 |
| 8 | 36425 |
| 9 | 155793 |
| 10 | 573382 |
| 11 | 1899933 |
| 12 | 5844446 |
| 13 | 17056486 |
| 14 | 47974934 |
| 15 | 131553646 |
| 16 | 354615679 |
| 17 | 945220982 |
| 18 | 2501450971 |
| 19 | 6590435731 |
| 20 | 17316698039 |
| 21 | 45428211431 |
| 22 | 119066290172 |
| 23 | 311909267867 |
| 24 | 816853717452 |
| 25 | 2138914514428 |
| 26 | 5600243896572 |
| 27 | 14662288678348 |
| 28 | 38387242941837 |