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 | 3 |
| 3 | 8 |
| 4 | 18 |
| 5 | 44 |
| 6 | 107 |
| 7 | 257 |
| 8 | 621 |
| 9 | 1500 |
| 10 | 3620 |
| 11 | 8740 |
| 12 | 21101 |
| 13 | 50941 |
| 14 | 122983 |
| 15 | 296908 |
| 16 | 716798 |
| 17 | 1730504 |
| 18 | 4177807 |
| 19 | 10086117 |
| 20 | 24350041 |
| 21 | 58786200 |
| 22 | 141922440 |
| 23 | 342631080 |
| 24 | 827184601 |
| 25 | 1997000281 |
| 26 | 4821185163 |
| 27 | 11639370608 |
| 28 | 28099926378 |
| 29 | 67839223364 |
| 30 | 163778373107 |