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 | 2 |
| 3 | 8 |
| 4 | 22 |
| 5 | 68 |
| 6 | 188 |
| 7 | 532 |
| 8 | 1444 |
| 9 | 3921 |
| 10 | 10446 |
| 11 | 27704 |
| 12 | 72714 |
| 13 | 189912 |
| 14 | 492760 |
| 15 | 1273064 |
| 16 | 3273896 |
| 17 | 8389489 |
| 18 | 21423994 |
| 19 | 54550728 |
| 20 | 138520286 |
| 21 | 350899964 |
| 22 | 886925652 |
| 23 | 2237284668 |
| 24 | 5633150988 |
| 25 | 14159465505 |
| 26 | 35535456518 |
| 27 | 89053087224 |
| 28 | 222870328210 |
| 29 | 557074041840 |
| 30 | 1390807477040 |