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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 10 |
| 5 | 21 |
| 6 | 50 |
| 7 | 130 |
| 8 | 332 |
| 9 | 840 |
| 10 | 2128 |
| 11 | 5408 |
| 12 | 13772 |
| 13 | 35102 |
| 14 | 89465 |
| 15 | 227961 |
| 16 | 580788 |
| 17 | 1479748 |
| 18 | 3770356 |
| 19 | 9606981 |
| 20 | 24478804 |
| 21 | 62372090 |
| 22 | 158923930 |
| 23 | 404938148 |
| 24 | 1031783666 |
| 25 | 2628989168 |
| 26 | 6698674670 |
| 27 | 17068245866 |
| 28 | 43489945955 |
| 29 | 110812526805 |