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 | 1 |
| 3 | 7 |
| 4 | 34 |
| 5 | 126 |
| 6 | 496 |
| 7 | 2052 |
| 8 | 8264 |
| 9 | 32776 |
| 10 | 130816 |
| 11 | 524272 |
| 12 | 2098144 |
| 13 | 8388576 |
| 14 | 33550336 |
| 15 | 134217792 |
| 16 | 536887424 |
| 17 | 2147483776 |
| 18 | 8589869056 |
| 19 | 34359738112 |
| 20 | 137439215104 |
| 21 | 549755813376 |
| 22 | 2199022206976 |
| 23 | 8796093023232 |
| 24 | 35184376285184 |
| 25 | 140737488357376 |
| 26 | 562949936644096 |