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 | 3 |
| 2 | 7 |
| 3 | 15 |
| 4 | 32 |
| 5 | 70 |
| 6 | 156 |
| 7 | 349 |
| 8 | 778 |
| 9 | 1728 |
| 10 | 3833 |
| 11 | 8505 |
| 12 | 18884 |
| 13 | 41943 |
| 14 | 93160 |
| 15 | 206897 |
| 16 | 459459 |
| 17 | 1020311 |
| 18 | 2265815 |
| 19 | 5031792 |
| 20 | 11174374 |
| 21 | 24815508 |
| 22 | 55108933 |
| 23 | 122382762 |
| 24 | 271780616 |
| 25 | 603555049 |
| 26 | 1340341377 |
| 27 | 2976555532 |
| 28 | 6610168495 |
| 29 | 14679492624 |