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) |
|---|---|
| 1 | 1 |
| 2 | 101 |
| 3 | 301 |
| 4 | 701 |
| 5 | 1501 |
| 6 | 3101 |
| 7 | 6301 |
| 8 | 12701 |
| 9 | 25501 |
| 10 | 51101 |
| 11 | 102301 |
| 12 | 204701 |
| 13 | 409501 |
| 14 | 819101 |
| 15 | 1638301 |
| 16 | 3276701 |
| 17 | 6553501 |
| 18 | 13107101 |
| 19 | 26214301 |
| 20 | 52428701 |
| 21 | 104857501 |
| 22 | 209715101 |
| 23 | 419430301 |
| 24 | 838860701 |
| 25 | 1677721501 |
| 26 | 3355443101 |
| 27 | 6710886301 |
| 28 | 13421772701 |
| 29 | 26843545501 |