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 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 17 |
| 6 | 111 |
| 7 | 156 |
| 8 | 1099 |
| 9 | 3072 |
| 10 | 21789 |
| 11 | 42334 |
| 12 | 528487 |
| 13 | 859501 |
| 14 | 8546878 |
| 15 | 31968376 |
| 16 | 159715435 |
| 17 | 398048505 |
| 18 | 5303677376 |
| 19 | 8835749346 |
| 20 | 99411964817 |
| 21 | 331215913868 |
| 22 | 1987084087016 |
| 23 | 4515860983384 |
| 24 | 62095480510303 |