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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 24 |
| 7 | 48 |
| 8 | 120 |
| 9 | 264 |
| 10 | 480 |
| 11 | 1104 |
| 12 | 2064 |
| 13 | 4128 |
| 14 | 10752 |
| 15 | 19320 |
| 16 | 38328 |
| 17 | 91992 |
| 18 | 170016 |
| 19 | 369600 |
| 20 | 745560 |
| 21 | 1854720 |
| 22 | 3845760 |
| 23 | 7765296 |
| 24 | 14990520 |
| 25 | 29910120 |
| 26 | 59856720 |
| 27 | 119710416 |
| 28 | 298755600 |
| 29 | 667297320 |
| 30 | 1446528360 |
| 31 | 4011171840 |