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 | 3 |
| 3 | 15 |
| 4 | 105 |
| 5 | 165 |
| 6 | 195 |
| 7 | 255 |
| 8 | 495 |
| 9 | 525 |
| 10 | 735 |
| 11 | 975 |
| 12 | 1155 |
| 13 | 1485 |
| 14 | 1785 |
| 15 | 1815 |
| 16 | 1995 |
| 17 | 2145 |
| 18 | 2415 |
| 19 | 2535 |
| 20 | 2625 |
| 21 | 2805 |
| 22 | 3045 |
| 23 | 3135 |
| 24 | 3255 |
| 25 | 3315 |
| 26 | 3675 |
| 27 | 3705 |
| 28 | 3795 |
| 29 | 3885 |
| 30 | 4305 |
| 31 | 4455 |
| 32 | 4485 |
| 33 | 4515 |
| 34 | 4785 |
| 35 | 4845 |
| 36 | 4875 |
| 37 | 4935 |
| 38 | 5115 |
| 39 | 5145 |
| 40 | 5445 |
| 41 | 5565 |
| 42 | 5655 |
| 43 | 5865 |
| 44 | 6045 |
| 45 | 6105 |
| 46 | 6195 |
| 47 | 6405 |