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 | 5 |
| 3 | 19 |
| 4 | 63 |
| 5 | 192 |
| 6 | 552 |
| 7 | 1520 |
| 8 | 4048 |
| 9 | 10496 |
| 10 | 26624 |
| 11 | 66304 |
| 12 | 162560 |
| 13 | 393216 |
| 14 | 940032 |
| 15 | 2224128 |
| 16 | 5214208 |
| 17 | 12124160 |
| 18 | 27983872 |
| 19 | 64159744 |
| 20 | 146210816 |
| 21 | 331350016 |
| 22 | 747110400 |
| 23 | 1676673024 |
| 24 | 3746562048 |
| 25 | 8338276352 |
| 26 | 18488492032 |