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 | 9 |
| 2 | 53 |
| 3 | 260 |
| 4 | 1156 |
| 5 | 4845 |
| 6 | 19551 |
| 7 | 76912 |
| 8 | 297275 |
| 9 | 1134705 |
| 10 | 4292145 |
| 11 | 16128061 |
| 12 | 60304951 |
| 13 | 224660626 |
| 14 | 834641671 |
| 15 | 3094322026 |
| 16 | 11453607152 |
| 17 | 42344301686 |
| 18 | 156404021389 |
| 19 | 577291806894 |
| 20 | 2129654436910 |
| 21 | 7853149169635 |
| 22 | 28949515515376 |
| 23 | 106692395098433 |
| 24 | 393137817645838 |