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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 8 |
| 10 | 44 |
| 11 | 164 |
| 12 | 494 |
| 13 | 1286 |
| 14 | 3002 |
| 15 | 6434 |
| 16 | 12869 |
| 17 | 194464 |
| 18 | 1925200 |
| 19 | 12394480 |
| 20 | 62224336 |
| 21 | 261667792 |
| 22 | 959874928 |
| 23 | 3154435120 |
| 24 | 9464040829 |
| 25 | 210311057024 |
| 26 | 3007458113984 |
| 27 | 27514536974144 |
| 28 | 193384741516784 |
| 29 | 1123028832217904 |
| 30 | 5617639404687824 |