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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 5 |
| 8 | 7 |
| 9 | 16 |
| 10 | 28 |
| 11 | 63 |
| 12 | 131 |
| 13 | 301 |
| 14 | 673 |
| 15 | 1600 |
| 16 | 3773 |
| 17 | 9158 |
| 18 | 22319 |
| 19 | 55255 |
| 20 | 137563 |
| 21 | 345930 |
| 22 | 874736 |
| 23 | 2227371 |
| 24 | 5700069 |
| 25 | 14664077 |
| 26 | 37888336 |
| 27 | 98310195 |
| 28 | 256037795 |
| 29 | 669184336 |
| 30 | 1754609183 |
| 31 | 4614527680 |