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 | 3 |
| 3 | 6 |
| 4 | 14 |
| 5 | 29 |
| 6 | 61 |
| 7 | 124 |
| 8 | 252 |
| 9 | 507 |
| 10 | 1019 |
| 11 | 2042 |
| 12 | 4090 |
| 13 | 8185 |
| 14 | 16377 |
| 15 | 32760 |
| 16 | 65528 |
| 17 | 131063 |
| 18 | 262135 |
| 19 | 524278 |
| 20 | 1048566 |
| 21 | 2097141 |
| 22 | 4194293 |
| 23 | 8388596 |
| 24 | 16777204 |
| 25 | 33554419 |
| 26 | 67108851 |
| 27 | 134217714 |
| 28 | 268435442 |
| 29 | 536870897 |
| 30 | 1073741809 |
| 31 | 2147483632 |