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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 16 |
| 6 | 42 |
| 7 | 99 |
| 8 | 219 |
| 9 | 466 |
| 10 | 968 |
| 11 | 1981 |
| 12 | 4017 |
| 13 | 8100 |
| 14 | 16278 |
| 15 | 32647 |
| 16 | 65399 |
| 17 | 130918 |
| 18 | 261972 |
| 19 | 524097 |
| 20 | 1048365 |
| 21 | 2096920 |
| 22 | 4194050 |
| 23 | 8388331 |
| 24 | 16776915 |
| 25 | 33554106 |
| 26 | 67108512 |
| 27 | 134217349 |
| 28 | 268435049 |
| 29 | 536870476 |
| 30 | 1073741358 |
| 31 | 2147483151 |
| 32 | 4294966767 |
| 33 | 8589934030 |