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 | 11 |
| 1 | 31 |
| 2 | 91 |
| 3 | 271 |
| 4 | 811 |
| 5 | 2431 |
| 6 | 7291 |
| 7 | 21871 |
| 8 | 65611 |
| 9 | 196831 |
| 10 | 590491 |
| 11 | 1771471 |
| 12 | 5314411 |
| 13 | 15943231 |
| 14 | 47829691 |
| 15 | 143489071 |
| 16 | 430467211 |
| 17 | 1291401631 |
| 18 | 3874204891 |
| 19 | 11622614671 |
| 20 | 34867844011 |
| 21 | 104603532031 |
| 22 | 313810596091 |
| 23 | 941431788271 |
| 24 | 2824295364811 |