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 | 2 |
| 5 | 6 |
| 6 | 16 |
| 7 | 40 |
| 8 | 94 |
| 9 | 214 |
| 10 | 476 |
| 11 | 1040 |
| 12 | 2242 |
| 13 | 4782 |
| 14 | 10112 |
| 15 | 21232 |
| 16 | 44318 |
| 17 | 92046 |
| 18 | 190364 |
| 19 | 392264 |
| 20 | 805746 |
| 21 | 1650518 |
| 22 | 3372816 |
| 23 | 6877656 |
| 24 | 13998142 |
| 25 | 28442918 |
| 26 | 57707324 |
| 27 | 116925600 |
| 28 | 236630274 |
| 29 | 478372062 |
| 30 | 966145664 |
| 31 | 1949583456 |
| 32 | 3930972094 |
| 33 | 7920443038 |
| 34 | 15948482236 |