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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 4 |
| 7 | 128 |
| 8 | 6 |
| 9 | 5 |
| 10 | 16 |
| 11 | 32768 |
| 12 | 12 |
| 13 | 2147483648 |
| 14 | 256 |
| 15 | 32 |
| 16 | 7 |
| 17 | 9223372036854775808 |
| 18 | 10 |
| 19 | 170141183460469231731687303715884105728 |
| 20 | 48 |
| 21 | 512 |
| 22 | 65536 |
| 23 | 57896044618658097711785492504343953926634992332820282019728792003956564819968 |
| 24 | 24 |
| 25 | 17 |
| 26 | 4294967296 |
| 27 | 20 |
| 28 | 768 |