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 | 240 |
| 2 | 4120 |
| 3 | 42400 |
| 4 | 263156 |
| 5 | 1154444 |
| 6 | 4116620 |
| 7 | 12297972 |
| 8 | 32313804 |
| 9 | 76590192 |
| 10 | 167150680 |
| 11 | 340541012 |
| 12 | 655325864 |
| 13 | 1200479148 |
| 14 | 2107926892 |
| 15 | 3567580824 |
| 16 | 5846311812 |
| 17 | 9310701480 |
| 18 | 14457811924 |
| 19 | 21942849820 |
| 20 | 32624138612 |
| 21 | 47607833428 |