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 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 5 |
| 6 | 120 |
| 7 | 7 |
| 8 | 280 |
| 9 | 63 |
| 10 | 540 |
| 11 | 11 |
| 12 | 83160 |
| 13 | 13 |
| 14 | 1456 |
| 15 | 2145 |
| 16 | 28080 |
| 17 | 17 |
| 18 | 636480 |
| 19 | 19 |
| 20 | 1136960 |
| 21 | 5985 |
| 22 | 5544 |
| 23 | 23 |
| 24 | 1070845776 |
| 25 | 525 |
| 26 | 9100 |
| 27 | 12825 |
| 28 | 6237000 |
| 29 | 29 |
| 30 | 5320224000 |
| 31 | 31 |
| 32 | 12226400 |
| 33 | 23529 |
| 34 | 20196 |
| 35 | 31465 |
| 36 | 582876756000 |
| 37 | 37 |
| 38 | 28120 |
| 39 | 38961 |
| 40 | 44639955360 |