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 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 18 |
| 5 | 24 |
| 6 | 42 |
| 7 | 54 |
| 8 | 120 |
| 9 | 258 |
| 10 | 396 |
| 11 | 420 |
| 12 | 594 |
| 13 | 744 |
| 14 | 840 |
| 15 | 1074 |
| 16 | 1800 |
| 17 | 2130 |
| 18 | 2172 |
| 19 | 2256 |
| 20 | 2304 |
| 21 | 2550 |
| 22 | 2778 |
| 23 | 3282 |
| 24 | 3792 |
| 25 | 3894 |
| 26 | 4170 |
| 27 | 4488 |
| 28 | 4578 |
| 29 | 4626 |
| 30 | 4848 |
| 31 | 5562 |
| 32 | 5754 |
| 33 | 6192 |
| 34 | 6252 |
| 35 | 7260 |
| 36 | 7428 |
| 37 | 7920 |
| 38 | 9654 |