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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 12 |
| 5 | 29 |
| 6 | 62 |
| 7 | 123 |
| 8 | 248 |
| 9 | 505 |
| 10 | 1018 |
| 11 | 2047 |
| 12 | 4084 |
| 13 | 8181 |
| 14 | 16374 |
| 15 | 32755 |
| 16 | 65520 |
| 17 | 131057 |
| 18 | 262130 |
| 19 | 524279 |
| 20 | 1048572 |
| 21 | 2097133 |
| 22 | 4194286 |
| 23 | 8388587 |
| 24 | 16777192 |
| 25 | 33554409 |
| 26 | 67108842 |
| 27 | 134217711 |
| 28 | 268435428 |
| 29 | 536870885 |