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 | 6 |
| 3 | 36 |
| 4 | 66 |
| 5 | 252 |
| 6 | 336 |
| 7 | 672 |
| 8 | 1008 |
| 9 | 3528 |
| 10 | 2016 |
| 11 | 4032 |
| 12 | 3696 |
| 13 | 9072 |
| 14 | 7392 |
| 15 | 13104 |
| 16 | 11088 |
| 17 | 36288 |
| 18 | 38304 |
| 19 | 26208 |
| 20 | 22176 |
| 21 | 68544 |
| 22 | 44352 |
| 23 | 91728 |
| 24 | 66528 |
| 25 | 154224 |
| 26 | 99792 |
| 27 | 209664 |
| 28 | 96096 |
| 29 | 301392 |
| 30 | 144144 |
| 31 | 222768 |
| 32 | 188496 |
| 33 | 487872 |
| 34 | 399168 |
| 35 | 471744 |
| 36 | 421344 |
| 37 | 1079568 |
| 38 | 288288 |
| 39 | 1097712 |
| 40 | 432432 |