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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 11 |
| 6 | 27 |
| 7 | 55 |
| 8 | 127 |
| 9 | 285 |
| 10 | 647 |
| 11 | 1457 |
| 12 | 3297 |
| 13 | 7489 |
| 14 | 16945 |
| 15 | 38523 |
| 16 | 87293 |
| 17 | 198179 |
| 18 | 449907 |
| 19 | 1021135 |
| 20 | 2318527 |
| 21 | 5263581 |
| 22 | 11950967 |
| 23 | 27133985 |
| 24 | 61609953 |
| 25 | 139888777 |
| 26 | 317629465 |
| 27 | 721215027 |
| 28 | 1637598485 |
| 29 | 3718378619 |
| 30 | 8443065363 |
| 31 | 19171129327 |