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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 6 |
| 7 | 14 |
| 8 | 35 |
| 9 | 77 |
| 10 | 166 |
| 11 | 346 |
| 12 | 707 |
| 13 | 1427 |
| 14 | 2865 |
| 15 | 5732 |
| 16 | 11428 |
| 17 | 22710 |
| 18 | 45102 |
| 19 | 89442 |
| 20 | 177329 |
| 21 | 351374 |
| 22 | 696093 |
| 23 | 1378860 |
| 24 | 2731235 |
| 25 | 5409540 |
| 26 | 10715171 |
| 27 | 21226041 |
| 28 | 42050951 |
| 29 | 83315605 |
| 30 | 165092603 |
| 31 | 327175955 |