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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 4 |
| 9 | 16 |
| 10 | 49 |
| 11 | 140 |
| 12 | 390 |
| 13 | 1039 |
| 14 | 2724 |
| 15 | 7058 |
| 16 | 18239 |
| 17 | 46964 |
| 18 | 121322 |
| 19 | 314155 |
| 20 | 817407 |
| 21 | 2136273 |
| 22 | 5611821 |
| 23 | 14811062 |
| 24 | 39275823 |
| 25 | 104603284 |
| 26 | 279746752 |
| 27 | 751001466 |
| 28 | 2023355751 |
| 29 | 5469448788 |
| 30 | 14830713681 |
| 31 | 40330618790 |
| 32 | 109972131832 |
| 33 | 300628497213 |
| 34 | 823779154305 |
| 35 | 2262365724468 |