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 | 7 |
| 2 | 17 |
| 3 | 37 |
| 4 | 87 |
| 5 | 187 |
| 6 | 437 |
| 7 | 937 |
| 8 | 2187 |
| 9 | 4687 |
| 10 | 10937 |
| 11 | 23437 |
| 12 | 54687 |
| 13 | 117187 |
| 14 | 273437 |
| 15 | 585937 |
| 16 | 1367187 |
| 17 | 2929687 |
| 18 | 6835937 |
| 19 | 14648437 |
| 20 | 34179687 |
| 21 | 73242187 |
| 22 | 170898437 |
| 23 | 366210937 |
| 24 | 854492187 |
| 25 | 1831054687 |
| 26 | 4272460937 |
| 27 | 9155273437 |
| 28 | 21362304687 |
| 29 | 45776367187 |
| 30 | 106811523437 |