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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 72 |
| 7 | 238 |
| 8 | 384 |
| 9 | 567 |
| 10 | 800 |
| 11 | 110 |
| 12 | 0 |
| 13 | 2184 |
| 14 | 784 |
| 15 | 0 |
| 16 | 0 |
| 17 | 1428 |
| 18 | 0 |
| 19 | 703 |
| 20 | 0 |
| 21 | 0 |
| 22 | 2904 |
| 23 | 4209 |
| 24 | 0 |
| 25 | 0 |
| 26 | 13520 |
| 27 | 0 |
| 28 | 0 |
| 29 | 15109 |
| 30 | 0 |
| 31 | 18228 |
| 32 | 0 |
| 33 | 0 |
| 34 | 30056 |
| 35 | 0 |
| 36 | 0 |
| 37 | 9546 |
| 38 | 14440 |
| 39 | 0 |
| 40 | 0 |
| 41 | 26855 |
| 42 | 0 |
| 43 | 23994 |
| 44 | 0 |
| 45 | 0 |
| 46 | 25392 |
| 47 | 13207 |
| 48 | 0 |
| 49 | 0 |
| 50 | 0 |
| 51 | 0 |
| 52 | 0 |
| 53 | 95453 |
| 54 | 0 |
| 55 | 0 |
| 56 | 0 |
| 57 | 0 |
| 58 | 148016 |
| 59 | 93928 |
| 60 | 0 |
| 61 | 208315 |