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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 48 |
| 5 | 150 |
| 6 | 90 |
| 7 | 490 |
| 8 | 2240 |
| 9 | 11340 |
| 10 | 2520 |
| 11 | 152460 |
| 12 | 83160 |
| 13 | 2342340 |
| 14 | 2522520 |
| 15 | 540540 |
| 16 | 11531520 |
| 17 | 104144040 |
| 18 | 110270160 |
| 19 | 737176440 |
| 20 | 775975200 |
| 21 | 162954792 |
| 22 | 56904848 |
| 23 | 1368302936 |
| 24 | 2141691552 |
| 25 | 111546435000 |
| 26 | 116008292400 |
| 27 | 1084231348200 |