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 | 20 |
| 3 | 189 |
| 4 | 1100 |
| 5 | 4615 |
| 6 | 15372 |
| 7 | 43219 |
| 8 | 106808 |
| 9 | 238581 |
| 10 | 491380 |
| 11 | 946913 |
| 12 | 1726308 |
| 13 | 3002987 |
| 14 | 5018092 |
| 15 | 8098695 |
| 16 | 12679024 |
| 17 | 19324937 |
| 18 | 28761876 |
| 19 | 41906533 |
| 20 | 59902460 |
| 21 | 84159855 |
| 22 | 116399756 |
| 23 | 158702875 |
| 24 | 213563304 |
| 25 | 283947325 |
| 26 | 373357556 |
| 27 | 485902665 |
| 28 | 626372884 |
| 29 | 800321555 |