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 | 3 |
| 3 | 11 |
| 4 | 27 |
| 5 | 91 |
| 6 | 219 |
| 7 | 731 |
| 8 | 1755 |
| 9 | 5851 |
| 10 | 14043 |
| 11 | 46811 |
| 12 | 112347 |
| 13 | 374491 |
| 14 | 898779 |
| 15 | 2995931 |
| 16 | 7190235 |
| 17 | 23967451 |
| 18 | 57521883 |
| 19 | 191739611 |
| 20 | 460175067 |
| 21 | 1533916891 |
| 22 | 3681400539 |
| 23 | 12271335131 |
| 24 | 29451204315 |
| 25 | 98170681051 |
| 26 | 235609634523 |