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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 9 |
| 6 | 18 |
| 7 | 35 |
| 8 | 67 |
| 9 | 131 |
| 10 | 257 |
| 11 | 505 |
| 12 | 996 |
| 13 | 1973 |
| 14 | 3915 |
| 15 | 7781 |
| 16 | 15486 |
| 17 | 30855 |
| 18 | 61527 |
| 19 | 122764 |
| 20 | 245069 |
| 21 | 489412 |
| 22 | 977673 |
| 23 | 1953515 |
| 24 | 3904108 |
| 25 | 7803545 |
| 26 | 15599618 |
| 27 | 31187269 |
| 28 | 62355347 |
| 29 | 124679883 |
| 30 | 249310255 |
| 31 | 498540890 |
| 32 | 996953659 |
| 33 | 1993701032 |
| 34 | 3987069747 |
| 35 | 7973603891 |