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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 14 |
| 8 | 36 |
| 9 | 72 |
| 10 | 165 |
| 11 | 330 |
| 12 | 715 |
| 13 | 1430 |
| 14 | 3004 |
| 15 | 6008 |
| 16 | 12393 |
| 17 | 24786 |
| 18 | 50559 |
| 19 | 101118 |
| 20 | 204820 |
| 21 | 409640 |
| 22 | 826045 |
| 23 | 1652090 |
| 24 | 3321891 |
| 25 | 6643782 |
| 26 | 13333932 |
| 27 | 26667864 |
| 28 | 53457121 |
| 29 | 106914242 |
| 30 | 214146295 |
| 31 | 428292590 |
| 32 | 857417220 |
| 33 | 1714834440 |
| 34 | 3431847189 |