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 | 16 |
| 4 | 36 |
| 5 | 144 |
| 6 | 576 |
| 7 | 900 |
| 8 | 3600 |
| 9 | 14400 |
| 10 | 32400 |
| 11 | 44100 |
| 12 | 129600 |
| 13 | 176400 |
| 14 | 705600 |
| 15 | 1587600 |
| 16 | 2822400 |
| 17 | 6350400 |
| 18 | 21344400 |
| 19 | 57153600 |
| 20 | 85377600 |
| 21 | 192099600 |
| 22 | 341510400 |
| 23 | 768398400 |
| 24 | 3073593600 |
| 25 | 6915585600 |
| 26 | 12294374400 |
| 27 | 14428814400 |
| 28 | 32464832400 |
| 29 | 57715257600 |
| 30 | 129859329600 |