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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 3 |
| 8 | 9 |
| 9 | 13 |
| 10 | 35 |
| 11 | 59 |
| 12 | 147 |
| 13 | 280 |
| 14 | 669 |
| 15 | 1347 |
| 16 | 3142 |
| 17 | 6545 |
| 18 | 15110 |
| 19 | 32057 |
| 20 | 73625 |
| 21 | 158056 |
| 22 | 362280 |
| 23 | 783800 |
| 24 | 1795134 |
| 25 | 3906573 |
| 26 | 8946154 |
| 27 | 19558340 |