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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 7 |
| 7 | 13 |
| 8 | 16 |
| 9 | 19 |
| 10 | 38 |
| 11 | 57 |
| 12 | 136 |
| 13 | 253 |
| 14 | 487 |
| 15 | 604 |
| 16 | 721 |
| 17 | 1442 |
| 18 | 2163 |
| 19 | 5164 |
| 20 | 9607 |
| 21 | 18493 |
| 22 | 22936 |
| 23 | 27379 |
| 24 | 54758 |
| 25 | 82137 |
| 26 | 196096 |
| 27 | 364813 |
| 28 | 702247 |
| 29 | 870964 |
| 30 | 1039681 |
| 31 | 2079362 |
| 32 | 3119043 |
| 33 | 7446484 |
| 34 | 13853287 |
| 35 | 26666893 |
| 36 | 33073696 |
| 37 | 39480499 |
| 38 | 78960998 |
| 39 | 118441497 |
| 40 | 282770296 |