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 | 4 |
| 3 | 16 |
| 4 | 61 |
| 5 | 229 |
| 6 | 856 |
| 7 | 3196 |
| 8 | 11929 |
| 9 | 44521 |
| 10 | 166156 |
| 11 | 620104 |
| 12 | 2314261 |
| 13 | 8636941 |
| 14 | 32233504 |
| 15 | 120297076 |
| 16 | 448954801 |
| 17 | 1675522129 |
| 18 | 6253133716 |
| 19 | 23337012736 |
| 20 | 87094917229 |
| 21 | 325042656181 |
| 22 | 1213075707496 |
| 23 | 4527260173804 |
| 24 | 16895964987721 |