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 | 2 |
| 3 | -2 |
| 4 | 5 |
| 5 | -3 |
| 6 | 15 |
| 7 | 3 |
| 8 | 59 |
| 9 | 73 |
| 10 | 308 |
| 11 | 632 |
| 12 | 1951 |
| 13 | 4829 |
| 14 | 13674 |
| 15 | 36306 |
| 16 | 100827 |
| 17 | 275493 |
| 18 | 765150 |
| 19 | 2120466 |
| 20 | 5918943 |
| 21 | 16547595 |
| 22 | 46452387 |
| 23 | 130703031 |
| 24 | 368825661 |
| 25 | 1043125407 |
| 26 | 2957013140 |
| 27 | 8399389528 |
| 28 | 23904802109 |
| 29 | 68154435941 |
| 30 | 194639738503 |
| 31 | 556733127851 |
| 32 | 1594781146419 |