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 | 4 |
| 1 | 3 |
| 2 | 4 |
| 3 | 9 |
| 4 | 22 |
| 5 | 51 |
| 6 | 112 |
| 7 | 237 |
| 8 | 490 |
| 9 | 999 |
| 10 | 2020 |
| 11 | 4065 |
| 12 | 8158 |
| 13 | 16347 |
| 14 | 32728 |
| 15 | 65493 |
| 16 | 131026 |
| 17 | 262095 |
| 18 | 524236 |
| 19 | 1048521 |
| 20 | 2097094 |
| 21 | 4194243 |
| 22 | 8388544 |
| 23 | 16777149 |
| 24 | 33554362 |
| 25 | 67108791 |
| 26 | 134217652 |
| 27 | 268435377 |
| 28 | 536870830 |
| 29 | 1073741739 |
| 30 | 2147483560 |
| 31 | 4294967205 |
| 32 | 8589934498 |