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 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 9 |
| 6 | 17 |
| 7 | 33 |
| 8 | 63 |
| 9 | 128 |
| 10 | 248 |
| 11 | 495 |
| 12 | 988 |
| 13 | 1969 |
| 14 | 3911 |
| 15 | 7857 |
| 16 | 15635 |
| 17 | 31304 |
| 18 | 62732 |
| 19 | 125501 |
| 20 | 250793 |
| 21 | 503203 |
| 22 | 1006339 |
| 23 | 2014992 |
| 24 | 4035985 |
| 25 | 8080448 |
| 26 | 16169267 |
| 27 | 32397761 |
| 28 | 64826967 |
| 29 | 129774838 |
| 30 | 259822143 |
| 31 | 520063531 |
| 32 | 1040616486 |
| 33 | 2083345793 |
| 34 | 4168640894 |
| 35 | 8342197304 |
| 36 | 16694070805 |
| 37 | 33404706520 |
| 38 | 66832674546 |
| 39 | 133736345590 |