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 | 2 |
| 2 | 6 |
| 3 | 17 |
| 4 | 51 |
| 5 | 154 |
| 6 | 473 |
| 7 | 1464 |
| 8 | 4568 |
| 9 | 14332 |
| 10 | 45187 |
| 11 | 143024 |
| 12 | 454217 |
| 13 | 1446604 |
| 14 | 4618576 |
| 15 | 14777451 |
| 16 | 47371177 |
| 17 | 152110326 |
| 18 | 489165277 |
| 19 | 1575211177 |
| 20 | 5078690936 |
| 21 | 16392526502 |
| 22 | 52963765321 |
| 23 | 171282782902 |
| 24 | 554393341371 |
| 25 | 1795821017014 |