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 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 1 |
| 5 | 9 |
| 6 | 10 |
| 7 | 42 |
| 8 | 64 |
| 9 | 213 |
| 10 | 400 |
| 11 | 1180 |
| 12 | 2510 |
| 13 | 6918 |
| 14 | 15842 |
| 15 | 42134 |
| 16 | 100966 |
| 17 | 263894 |
| 18 | 650688 |
| 19 | 1687746 |
| 20 | 4238855 |
| 21 | 10968196 |
| 22 | 27888906 |
| 23 | 72187356 |
| 24 | 185141385 |
| 25 | 480025465 |
| 26 | 1238940890 |
| 27 | 3219591600 |
| 28 | 8350054339 |
| 29 | 21752631006 |
| 30 | 56634075418 |
| 31 | 147899071110 |
| 32 | 386293111740 |