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 | 1 |
| 1 | 5 |
| 2 | 29 |
| 3 | 149 |
| 4 | 765 |
| 5 | 3941 |
| 6 | 20301 |
| 7 | 104565 |
| 8 | 538589 |
| 9 | 2774149 |
| 10 | 14289005 |
| 11 | 73599381 |
| 12 | 379093501 |
| 13 | 1952623525 |
| 14 | 10057515149 |
| 15 | 51803949749 |
| 16 | 266830242845 |
| 17 | 1374381274821 |
| 18 | 7079122173101 |
| 19 | 36462931836885 |