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 | 2 |
| 3 | 5 |
| 4 | 15 |
| 5 | 49 |
| 6 | 170 |
| 7 | 613 |
| 8 | 2275 |
| 9 | 8629 |
| 10 | 33301 |
| 11 | 130333 |
| 12 | 516077 |
| 13 | 2063685 |
| 14 | 8321892 |
| 15 | 33803161 |
| 16 | 138181521 |
| 17 | 568031297 |
| 18 | 2346668400 |
| 19 | 9737766513 |
| 20 | 40569611691 |
| 21 | 169632827345 |
| 22 | 711611670532 |
| 23 | 2994165070045 |
| 24 | 12632782541053 |
| 25 | 53433933353885 |
| 26 | 226540298098019 |