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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 9 |
| 8 | 38 |
| 9 | 131 |
| 10 | 387 |
| 11 | 1025 |
| 12 | 2512 |
| 13 | 5834 |
| 14 | 13152 |
| 15 | 29805 |
| 16 | 71858 |
| 17 | 197325 |
| 18 | 635938 |
| 19 | 2311865 |
| 20 | 8867078 |
| 21 | 34201676 |
| 22 | 129669923 |
| 23 | 479650565 |
| 24 | 1731405819 |
| 25 | 6124746296 |
| 26 | 21382533684 |
| 27 | 74413732788 |
| 28 | 261584276096 |
| 29 | 943601869926 |
| 30 | 3547521313455 |
| 31 | 14045005473985 |