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 | 2 |
| 4 | 6 |
| 5 | 18 |
| 6 | 41 |
| 7 | 94 |
| 8 | 198 |
| 9 | 416 |
| 10 | 853 |
| 11 | 1746 |
| 12 | 3531 |
| 13 | 7151 |
| 14 | 14415 |
| 15 | 29049 |
| 16 | 58431 |
| 17 | 117528 |
| 18 | 236145 |
| 19 | 474436 |
| 20 | 952627 |
| 21 | 1912494 |
| 22 | 3838175 |
| 23 | 7701540 |
| 24 | 15449676 |
| 25 | 30988137 |
| 26 | 62142415 |
| 27 | 124600422 |
| 28 | 249795358 |
| 29 | 500719994 |
| 30 | 1003575768 |
| 31 | 2011211100 |
| 32 | 4030123185 |
| 33 | 8074898552 |
| 34 | 16177657763 |
| 35 | 32408393211 |
| 36 | 64917907623 |