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 | 3 |
| 2 | 9 |
| 3 | 21 |
| 4 | 81 |
| 5 | 105 |
| 6 | 225 |
| 7 | 945 |
| 8 | 5265 |
| 9 | 5985 |
| 10 | 11025 |
| 11 | 16065 |
| 12 | 36225 |
| 13 | 89505 |
| 14 | 105105 |
| 15 | 187425 |
| 16 | 345345 |
| 17 | 389025 |
| 18 | 1044225 |
| 19 | 2027025 |
| 20 | 4189185 |
| 21 | 6185025 |
| 22 | 20307105 |
| 23 | 27776385 |
| 24 | 76039425 |
| 25 | 107972865 |
| 26 | 286711425 |
| 27 | 402026625 |
| 28 | 1853445825 |
| 29 | 2440353825 |
| 30 | 3807428625 |
| 31 | 5106886785 |
| 32 | 9449834625 |