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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 4 |
| 4 | 4 |
| 5 | 1 |
| 6 | 128 |
| 7 | 120 |
| 8 | 36 |
| 9 | 4 |
| 10 | 6432 |
| 11 | 5952 |
| 12 | 1920 |
| 13 | 288 |
| 14 | 18 |
| 15 | 494592 |
| 16 | 458880 |
| 17 | 154560 |
| 18 | 26400 |
| 19 | 2400 |
| 20 | 96 |
| 21 | 55027200 |
| 22 | 51448320 |
| 23 | 17832960 |
| 24 | 3279360 |
| 25 | 352800 |
| 26 | 21600 |
| 27 | 600 |
| 28 | 8455495680 |
| 29 | 7975296000 |
| 30 | 2819013120 |
| 31 | 543110400 |
| 32 | 64350720 |
| 33 | 4798080 |
| 34 | 211680 |
| 35 | 4320 |
| 36 | 1729137070080 |
| 37 | 1644441845760 |
| 38 | 589071974400 |