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) |
|---|---|
| 2 | 10 |
| 3 | 80 |
| 4 | 350 |
| 5 | 1120 |
| 6 | 2940 |
| 7 | 6720 |
| 8 | 13860 |
| 9 | 26400 |
| 10 | 47190 |
| 11 | 80080 |
| 12 | 130130 |
| 13 | 203840 |
| 14 | 309400 |
| 15 | 456960 |
| 16 | 658920 |
| 17 | 930240 |
| 18 | 1288770 |
| 19 | 1755600 |
| 20 | 2355430 |
| 21 | 3116960 |
| 22 | 4073300 |
| 23 | 5262400 |
| 24 | 6727500 |
| 25 | 8517600 |
| 26 | 10687950 |
| 27 | 13300560 |
| 28 | 16424730 |
| 29 | 20137600 |