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 | 23 |
| 3 | 63 |
| 4 | 157 |
| 5 | 383 |
| 6 | 963 |
| 7 | 2551 |
| 8 | 7097 |
| 9 | 20439 |
| 10 | 60079 |
| 11 | 178511 |
| 12 | 533205 |
| 13 | 1596559 |
| 14 | 4785755 |
| 15 | 14352327 |
| 16 | 43050865 |
| 17 | 129145127 |
| 18 | 387426375 |
| 19 | 1162268383 |
| 20 | 3486792461 |
| 21 | 10460362527 |
| 22 | 31381070323 |
| 23 | 94143191063 |
| 24 | 282429550377 |
| 25 | 847288625143 |
| 26 | 2541865845983 |
| 27 | 7625597504751 |