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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 6 |
| 6 | 22 |
| 7 | 64 |
| 8 | 163 |
| 9 | 382 |
| 10 | 848 |
| 11 | 1816 |
| 12 | 3797 |
| 13 | 7814 |
| 14 | 15914 |
| 15 | 32192 |
| 16 | 64839 |
| 17 | 130238 |
| 18 | 261156 |
| 19 | 523128 |
| 20 | 1047225 |
| 21 | 2095590 |
| 22 | 4192510 |
| 23 | 8386560 |
| 24 | 16774891 |
| 25 | 33551806 |
| 26 | 67105912 |
| 27 | 134214424 |
| 28 | 268431773 |
| 29 | 536866822 |
| 30 | 1073737298 |