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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 1 |
| 11 | 0 |
| 12 | 6 |
| 13 | 8 |
| 14 | 9 |
| 15 | 44 |
| 16 | 210 |
| 17 | 420 |
| 18 | 610 |
| 19 | 540 |
| 20 | 216 |
| 21 | 7570 |
| 22 | 33120 |
| 23 | 66870 |
| 24 | 82080 |
| 25 | 66870 |
| 26 | 33120 |
| 27 | 7570 |
| 28 | 1975560 |
| 29 | 8171730 |
| 30 | 15729000 |
| 31 | 18433415 |
| 32 | 14372820 |
| 33 | 7499940 |
| 34 | 2398900 |
| 35 | 357435 |
| 36 | 749649145 |
| 37 | 2971510080 |
| 38 | 5508175260 |
| 39 | 6267658544 |
| 40 | 4815171270 |
| 41 | 2570369760 |
| 42 | 932429820 |
| 43 | 209185200 |
| 44 | 22040361 |