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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 7 |
| 6 | 14 |
| 7 | 43 |
| 8 | 86 |
| 9 | 259 |
| 10 | 518 |
| 11 | 1555 |
| 12 | 3110 |
| 13 | 9331 |
| 14 | 18662 |
| 15 | 55987 |
| 16 | 111974 |
| 17 | 335923 |
| 18 | 671846 |
| 19 | 2015539 |
| 20 | 4031078 |
| 21 | 12093235 |
| 22 | 24186470 |
| 23 | 72559411 |
| 24 | 145118822 |
| 25 | 435356467 |
| 26 | 870712934 |
| 27 | 2612138803 |
| 28 | 5224277606 |
| 29 | 15672832819 |
| 30 | 31345665638 |
| 31 | 94036996915 |
| 32 | 188073993830 |