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 | 6 |
| 3 | 19 |
| 4 | 58 |
| 5 | 146 |
| 6 | 380 |
| 7 | 883 |
| 8 | 2138 |
| 9 | 4774 |
| 10 | 11092 |
| 11 | 24190 |
| 12 | 54724 |
| 13 | 117508 |
| 14 | 260920 |
| 15 | 554179 |
| 16 | 1213690 |
| 17 | 2557022 |
| 18 | 5541092 |
| 19 | 11601610 |
| 20 | 24930860 |
| 21 | 51942076 |
| 22 | 110861896 |
| 23 | 230053614 |
| 24 | 488253348 |
| 25 | 1009853116 |
| 26 | 2133122760 |
| 27 | 4399720348 |
| 28 | 9256078408 |