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 | 8 |
| 2 | 24 |
| 3 | 76 |
| 4 | 272 |
| 5 | 1044 |
| 6 | 4120 |
| 7 | 16412 |
| 8 | 65568 |
| 9 | 262180 |
| 10 | 1048616 |
| 11 | 4194348 |
| 12 | 16777264 |
| 13 | 67108916 |
| 14 | 268435512 |
| 15 | 1073741884 |
| 16 | 4294967360 |
| 17 | 17179869252 |
| 18 | 68719476808 |
| 19 | 274877907020 |
| 20 | 1099511627856 |
| 21 | 4398046511188 |
| 22 | 17592186044504 |
| 23 | 70368744177756 |
| 24 | 281474976710752 |
| 25 | 1125899906842724 |