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 | 3 |
| 3 | 4 |
| 4 | 12 |
| 5 | 18 |
| 6 | 55 |
| 7 | 88 |
| 8 | 273 |
| 9 | 455 |
| 10 | 1428 |
| 11 | 2448 |
| 12 | 7752 |
| 13 | 13566 |
| 14 | 43263 |
| 15 | 76912 |
| 16 | 246675 |
| 17 | 444015 |
| 18 | 1430715 |
| 19 | 2601300 |
| 20 | 8414640 |
| 21 | 15426840 |
| 22 | 50067108 |
| 23 | 92431584 |
| 24 | 300830572 |
| 25 | 558685348 |
| 26 | 1822766520 |
| 27 | 3402497504 |
| 28 | 11124755664 |
| 29 | 20858916870 |
| 30 | 68328754959 |