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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 4 |
| 4 | 4 |
| 5 | 32 |
| 6 | 38 |
| 7 | 264 |
| 8 | 342 |
| 9 | 2288 |
| 10 | 3134 |
| 11 | 20740 |
| 12 | 29526 |
| 13 | 194916 |
| 14 | 285458 |
| 15 | 1885840 |
| 16 | 2822310 |
| 17 | 18682016 |
| 18 | 28440970 |
| 19 | 188717116 |
| 20 | 291294678 |
| 21 | 1937706144 |
| 22 | 3025232480 |
| 23 | 20173268632 |
| 24 | 31797822936 |
| 25 | 212530874156 |
| 26 | 337731551446 |
| 27 | 2262235585956 |
| 28 | 3620119437762 |
| 29 | 24297593488468 |