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) |
|---|---|
| 3 | 35 |
| 4 | 340 |
| 5 | 1750 |
| 6 | 6440 |
| 7 | 19110 |
| 8 | 48720 |
| 9 | 110880 |
| 10 | 231000 |
| 11 | 448305 |
| 12 | 820820 |
| 13 | 1431430 |
| 14 | 2395120 |
| 15 | 3867500 |
| 16 | 6054720 |
| 17 | 9224880 |
| 18 | 13721040 |
| 19 | 19975935 |
| 20 | 28528500 |
| 21 | 40042310 |
| 22 | 55326040 |
| 23 | 75356050 |
| 24 | 101301200 |
| 25 | 134550000 |
| 26 | 176740200 |
| 27 | 229790925 |
| 28 | 295937460 |