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 | -3 |
| 1 | -5 |
| 2 | -15 |
| 3 | -37 |
| 4 | -99 |
| 5 | -257 |
| 6 | -675 |
| 7 | -1765 |
| 8 | -4623 |
| 9 | -12101 |
| 10 | -31683 |
| 11 | -82945 |
| 12 | -217155 |
| 13 | -568517 |
| 14 | -1488399 |
| 15 | -3896677 |
| 16 | -10201635 |
| 17 | -26708225 |
| 18 | -69923043 |
| 19 | -183060901 |
| 20 | -479259663 |
| 21 | -1254718085 |
| 22 | -3284894595 |
| 23 | -8599965697 |
| 24 | -22515002499 |
| 25 | -58945041797 |
| 26 | -154320122895 |