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) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 210 |
| 3 | 1120 |
| 4 | 4410 |
| 5 | 14112 |
| 6 | 38808 |
| 7 | 95040 |
| 8 | 212355 |
| 9 | 440440 |
| 10 | 858858 |
| 11 | 1589952 |
| 12 | 2815540 |
| 13 | 4798080 |
| 14 | 7907040 |
| 15 | 12651264 |
| 16 | 19718181 |
| 17 | 30020760 |
| 18 | 44753170 |
| 19 | 65456160 |
| 20 | 94093230 |
| 21 | 133138720 |
| 22 | 185679000 |
| 23 | 255528000 |
| 24 | 347358375 |
| 25 | 466849656 |
| 26 | 620854794 |
| 27 | 817586560 |
| 28 | 1066825320 |