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 | 3 |
| 1 | 4 |
| 2 | 7 |
| 3 | 14 |
| 4 | 29 |
| 5 | 60 |
| 6 | 123 |
| 7 | 250 |
| 8 | 505 |
| 9 | 1016 |
| 10 | 2039 |
| 11 | 4086 |
| 12 | 8181 |
| 13 | 16372 |
| 14 | 32755 |
| 15 | 65522 |
| 16 | 131057 |
| 17 | 262128 |
| 18 | 524271 |
| 19 | 1048558 |
| 20 | 2097133 |
| 21 | 4194284 |
| 22 | 8388587 |
| 23 | 16777194 |
| 24 | 33554409 |
| 25 | 67108840 |
| 26 | 134217703 |
| 27 | 268435430 |
| 28 | 536870885 |
| 29 | 1073741796 |
| 30 | 2147483619 |