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 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 26 |
| 6 | 57 |
| 7 | 120 |
| 8 | 247 |
| 9 | 502 |
| 10 | 1013 |
| 11 | 2036 |
| 12 | 4083 |
| 13 | 8178 |
| 14 | 16369 |
| 15 | 32752 |
| 16 | 65519 |
| 17 | 131054 |
| 18 | 262125 |
| 19 | 524268 |
| 20 | 1048555 |
| 21 | 2097130 |
| 22 | 4194281 |
| 23 | 8388584 |
| 24 | 16777191 |
| 25 | 33554406 |
| 26 | 67108837 |
| 27 | 134217700 |
| 28 | 268435427 |
| 29 | 536870882 |
| 30 | 1073741793 |
| 31 | 2147483616 |
| 32 | 4294967263 |
| 33 | 8589934558 |