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 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 29 |
| 7 | 56 |
| 8 | 118 |
| 9 | 237 |
| 10 | 467 |
| 11 | 946 |
| 12 | 1905 |
| 13 | 3796 |
| 14 | 7618 |
| 15 | 15303 |
| 16 | 30614 |
| 17 | 61319 |
| 18 | 122951 |
| 19 | 246202 |
| 20 | 492971 |
| 21 | 987542 |
| 22 | 1977560 |
| 23 | 3959289 |
| 24 | 7927969 |
| 25 | 15873190 |
| 26 | 31776708 |
| 27 | 63614397 |
| 28 | 127346134 |
| 29 | 254908115 |
| 30 | 510233309 |
| 31 | 1021273672 |
| 32 | 2044071894 |
| 33 | 4091064805 |
| 34 | 8187770675 |