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) |
|---|---|
| 6 | 1 |
| 7 | 63 |
| 8 | 966 |
| 9 | 7770 |
| 10 | 42525 |
| 11 | 179487 |
| 12 | 627396 |
| 13 | 1899612 |
| 14 | 5135130 |
| 15 | 12662650 |
| 16 | 28936908 |
| 17 | 62022324 |
| 18 | 125854638 |
| 19 | 243577530 |
| 20 | 452329200 |
| 21 | 809944464 |
| 22 | 1404142047 |
| 23 | 2364885369 |
| 24 | 3880739170 |
| 25 | 6220194750 |
| 26 | 9759104355 |
| 27 | 15015551265 |
| 28 | 22693687380 |
| 29 | 33738295500 |
| 30 | 49402080000 |
| 31 | 71327958156 |