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 | 12 |
| 3 | 34 |
| 4 | 99 |
| 5 | 261 |
| 6 | 678 |
| 7 | 1692 |
| 8 | 4149 |
| 9 | 9959 |
| 10 | 23568 |
| 11 | 55014 |
| 12 | 127031 |
| 13 | 290457 |
| 14 | 658602 |
| 15 | 1482240 |
| 16 | 3314025 |
| 17 | 7365915 |
| 18 | 16285300 |
| 19 | 35832810 |
| 20 | 78500811 |
| 21 | 171293293 |
| 22 | 372412782 |
| 23 | 806963364 |
| 24 | 1743173469 |
| 25 | 3754782351 |
| 26 | 8066319768 |
| 27 | 17285917742 |
| 28 | 36957928479 |
| 29 | 78847115649 |