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 | 2 |
| 3 | 16 |
| 4 | 72 |
| 5 | 256 |
| 6 | 992 |
| 7 | 4096 |
| 8 | 16512 |
| 9 | 65536 |
| 10 | 261632 |
| 11 | 1048576 |
| 12 | 4196352 |
| 13 | 16777216 |
| 14 | 67100672 |
| 15 | 268435456 |
| 16 | 1073774592 |
| 17 | 4294967296 |
| 18 | 17179738112 |
| 19 | 68719476736 |
| 20 | 274878431232 |
| 21 | 1099511627776 |
| 22 | 4398044413952 |
| 23 | 17592186044416 |
| 24 | 70368752566272 |
| 25 | 281474976710656 |