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 | 0 |
| 4 | 4 |
| 5 | 15 |
| 6 | 41 |
| 7 | 98 |
| 8 | 218 |
| 9 | 465 |
| 10 | 967 |
| 11 | 1980 |
| 12 | 4016 |
| 13 | 8099 |
| 14 | 16277 |
| 15 | 32646 |
| 16 | 65398 |
| 17 | 130917 |
| 18 | 261971 |
| 19 | 524096 |
| 20 | 1048364 |
| 21 | 2096919 |
| 22 | 4194049 |
| 23 | 8388330 |
| 24 | 16776914 |
| 25 | 33554105 |
| 26 | 67108511 |
| 27 | 134217348 |
| 28 | 268435048 |
| 29 | 536870475 |
| 30 | 1073741357 |
| 31 | 2147483150 |
| 32 | 4294966766 |
| 33 | 8589934029 |