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 | 3 |
| 2 | 7 |
| 3 | 16 |
| 4 | 41 |
| 5 | 101 |
| 6 | 247 |
| 7 | 613 |
| 8 | 1529 |
| 9 | 3821 |
| 10 | 9539 |
| 11 | 23843 |
| 12 | 59611 |
| 13 | 149015 |
| 14 | 372539 |
| 15 | 931327 |
| 16 | 2328307 |
| 17 | 5820767 |
| 18 | 14551919 |
| 19 | 36379789 |
| 20 | 90949471 |
| 21 | 227373677 |
| 22 | 568434193 |
| 23 | 1421085473 |
| 24 | 3552713687 |
| 25 | 8881784201 |
| 26 | 22204460497 |
| 27 | 55511151233 |
| 28 | 138777878081 |
| 29 | 346944695197 |
| 30 | 867361737989 |