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 | 10 |
| 4 | 167 |
| 5 | 1720 |
| 6 | 14065 |
| 7 | 100156 |
| 8 | 649950 |
| 9 | 3944928 |
| 10 | 22764165 |
| 11 | 126264820 |
| 12 | 678405090 |
| 13 | 3550829360 |
| 14 | 18182708362 |
| 15 | 91392185080 |
| 16 | 452077562620 |
| 17 | 2205359390592 |
| 18 | 10627956019245 |
| 19 | 50668344988068 |
| 20 | 239250231713210 |
| 21 | 1120028580999440 |
| 22 | 5202779260636958 |
| 23 | 23998704563581000 |
| 24 | 109991785264412452 |