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 | 12 |
| 3 | 54 |
| 4 | 264 |
| 5 | 420 |
| 6 | 396 |
| 7 | 1134 |
| 8 | 1200 |
| 9 | 1296 |
| 10 | 3780 |
| 11 | 2310 |
| 12 | 2520 |
| 13 | 3276 |
| 14 | 3612 |
| 15 | 4050 |
| 16 | 5088 |
| 17 | 5712 |
| 18 | 5724 |
| 19 | 7182 |
| 20 | 11400 |
| 21 | 9072 |
| 22 | 9372 |
| 23 | 10626 |
| 24 | 11088 |
| 25 | 12600 |
| 26 | 13260 |
| 27 | 14094 |
| 28 | 15960 |
| 29 | 17052 |
| 30 | 23220 |
| 31 | 19530 |
| 32 | 20928 |
| 33 | 21384 |
| 34 | 23052 |
| 35 | 26250 |
| 36 | 25704 |
| 37 | 27972 |
| 38 | 28956 |
| 39 | 30186 |
| 40 | 39600 |
| 41 | 34440 |
| 42 | 34524 |