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 | 6 |
| 3 | 66 |
| 4 | 120 |
| 5 | 276 |
| 6 | 378 |
| 7 | 630 |
| 8 | 780 |
| 9 | 1128 |
| 10 | 1326 |
| 11 | 1770 |
| 12 | 2016 |
| 13 | 2556 |
| 14 | 2850 |
| 15 | 3486 |
| 16 | 3828 |
| 17 | 4560 |
| 18 | 4950 |
| 19 | 5778 |
| 20 | 6216 |
| 21 | 7140 |
| 22 | 7626 |
| 23 | 8646 |
| 24 | 9180 |
| 25 | 10296 |
| 26 | 10878 |
| 27 | 12090 |
| 28 | 12720 |
| 29 | 14028 |
| 30 | 14706 |
| 31 | 16110 |
| 32 | 16836 |
| 33 | 18336 |
| 34 | 19110 |
| 35 | 20706 |
| 36 | 21528 |
| 37 | 23220 |
| 38 | 24090 |
| 39 | 25878 |
| 40 | 26796 |