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 | 8 |
| 3 | 31 |
| 4 | 90 |
| 5 | 225 |
| 6 | 516 |
| 7 | 1123 |
| 8 | 2366 |
| 9 | 4885 |
| 10 | 9960 |
| 11 | 20151 |
| 12 | 40578 |
| 13 | 81481 |
| 14 | 163340 |
| 15 | 327115 |
| 16 | 654726 |
| 17 | 1310013 |
| 18 | 2620656 |
| 19 | 5242015 |
| 20 | 10484810 |
| 21 | 20970481 |
| 22 | 41941908 |
| 23 | 83884851 |
| 24 | 167770830 |
| 25 | 335542885 |
| 26 | 671087096 |
| 27 | 1342175623 |
| 28 | 2684352786 |