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 | 3 |
| 2 | 7 |
| 3 | 26 |
| 4 | 56 |
| 5 | 216 |
| 6 | 462 |
| 7 | 1791 |
| 8 | 3828 |
| 9 | 14849 |
| 10 | 31735 |
| 11 | 123111 |
| 12 | 263108 |
| 13 | 1020696 |
| 14 | 2181389 |
| 15 | 8462447 |
| 16 | 18085587 |
| 17 | 70160958 |
| 18 | 149945056 |
| 19 | 581694636 |
| 20 | 1243173370 |
| 21 | 4822748423 |
| 22 | 10306975580 |
| 23 | 39984728949 |
| 24 | 85453685055 |
| 25 | 331507764639 |
| 26 | 708484485384 |
| 27 | 2748484256480 |
| 28 | 5873945233705 |