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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1 |
| 3 | 62 |
| 4 | 243 |
| 5 | 33 |
| 6 | 922 |
| 7 | 2699 |
| 8 | 13125 |
| 9 | 40393 |
| 10 | 1 |
| 11 | 2049 |
| 12 | 1075174 |
| 13 | 6401871 |
| 14 | 1 |
| 15 | 57592238 |
| 16 | 129336777 |
| 17 | 516822801 |
| 18 | 1163047905 |
| 19 | 524289 |
| 20 | 1 |
| 21 | 62770507831 |
| 22 | 1 |
| 23 | 8388609 |
| 24 | 1 |
| 25 | 847624153770 |
| 26 | 1 |
| 27 | 53379719265825 |
| 28 | 183016755558795 |
| 29 | 411784948543867 |