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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 24 |
| 7 | 67 |
| 8 | 182 |
| 9 | 520 |
| 10 | 1474 |
| 11 | 4248 |
| 12 | 12196 |
| 13 | 35168 |
| 14 | 101226 |
| 15 | 291565 |
| 16 | 838764 |
| 17 | 2412033 |
| 18 | 6929754 |
| 19 | 19896915 |
| 20 | 57084939 |
| 21 | 163677686 |
| 22 | 469008353 |
| 23 | 1343165478 |
| 24 | 3844533186 |
| 25 | 10998790991 |
| 26 | 31451726513 |
| 27 | 89899650912 |
| 28 | 256859865260 |
| 29 | 733620238080 |
| 30 | 2094559523979 |
| 31 | 5978195451960 |