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 | -4 |
| 1 | 5 |
| 2 | 6 |
| 3 | 17 |
| 4 | 40 |
| 5 | 97 |
| 6 | 234 |
| 7 | 565 |
| 8 | 1364 |
| 9 | 3293 |
| 10 | 7950 |
| 11 | 19193 |
| 12 | 46336 |
| 13 | 111865 |
| 14 | 270066 |
| 15 | 651997 |
| 16 | 1574060 |
| 17 | 3800117 |
| 18 | 9174294 |
| 19 | 22148705 |
| 20 | 53471704 |
| 21 | 129092113 |
| 22 | 311655930 |
| 23 | 752403973 |
| 24 | 1816463876 |
| 25 | 4385331725 |
| 26 | 10587127326 |
| 27 | 25559586377 |
| 28 | 61706300080 |
| 29 | 148972186537 |
| 30 | 359650673154 |