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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 198506 |
| 5 | 163840 |
| 6 | 20662272 |
| 7 | 45481984 |
| 8 | 745402040 |
| 9 | 1904738304 |
| 10 | 13582315520 |
| 11 | 32267304960 |
| 12 | 152158214640 |
| 13 | 321893203968 |
| 14 | 1194291679232 |
| 15 | 2263580016640 |
| 16 | 7176091448362 |