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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 5 |
| 7 | 10 |
| 8 | 19 |
| 9 | 38 |
| 10 | 76 |
| 11 | 152 |
| 12 | 303 |
| 13 | 605 |
| 14 | 1210 |
| 15 | 2420 |
| 16 | 4839 |
| 17 | 9678 |
| 18 | 19355 |
| 19 | 38709 |
| 20 | 77417 |
| 21 | 154834 |
| 22 | 309667 |
| 23 | 619333 |
| 24 | 1238665 |
| 25 | 2477330 |
| 26 | 4954660 |
| 27 | 9909319 |
| 28 | 19818638 |
| 29 | 39637275 |
| 30 | 79274549 |