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 | 7 |
| 2 | 19 |
| 3 | 43 |
| 4 | 111 |
| 5 | 287 |
| 6 | 763 |
| 7 | 2051 |
| 8 | 5575 |
| 9 | 15271 |
| 10 | 42099 |
| 11 | 116651 |
| 12 | 324591 |
| 13 | 906367 |
| 14 | 2538331 |
| 15 | 7126403 |
| 16 | 20049671 |
| 17 | 56509639 |
| 18 | 159514963 |
| 19 | 450865067 |
| 20 | 1275778031 |
| 21 | 3613401695 |
| 22 | 10242581819 |
| 23 | 29053799555 |
| 24 | 82461727687 |
| 25 | 234163952487 |