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 | 16 |
| 2 | 135 |
| 3 | 800 |
| 4 | 3739 |
| 5 | 14672 |
| 6 | 50252 |
| 7 | 154224 |
| 8 | 432174 |
| 9 | 1121456 |
| 10 | 2724183 |
| 11 | 6248128 |
| 12 | 13624922 |
| 13 | 28409312 |
| 14 | 56910017 |
| 15 | 109964720 |
| 16 | 205651975 |
| 17 | 373334400 |
| 18 | 659553555 |
| 19 | 1136450288 |
| 20 | 1913567669 |
| 21 | 3154109024 |
| 22 | 5096972454 |
| 23 | 8086166144 |
| 24 | 12609525259 |
| 25 | 19348999600 |
| 26 | 29245158395 |
| 27 | 43578960064 |