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 | 0 |
| 1 | 3 |
| 2 | 13 |
| 3 | 47 |
| 4 | 55 |
| 5 | 254 |
| 6 | 767 |
| 7 | 987 |
| 8 | 6909 |
| 9 | 16127 |
| 10 | 28657 |
| 11 | 28670 |
| 12 | 125951 |
| 13 | 196575 |
| 14 | 393213 |
| 15 | 4160255 |
| 16 | 4177911 |
| 17 | 25157623 |
| 18 | 25157631 |
| 19 | 46137325 |
| 20 | 67088375 |
| 21 | 268296191 |
| 22 | 268434303 |
| 23 | 268435455 |