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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 45 |
| 7 | 98 |
| 8 | 211 |
| 9 | 445 |
| 10 | 927 |
| 11 | 1909 |
| 12 | 3901 |
| 13 | 7920 |
| 14 | 16011 |
| 15 | 32260 |
| 16 | 64852 |
| 17 | 130157 |
| 18 | 260932 |
| 19 | 522691 |
| 20 | 1046489 |
| 21 | 2094438 |
| 22 | 4190798 |
| 23 | 8384100 |
| 24 | 16771453 |
| 25 | 33547094 |
| 26 | 67099568 |
| 27 | 134205996 |
| 28 | 268420714 |
| 29 | 536852452 |
| 30 | 1073718799 |
| 31 | 2147455019 |
| 32 | 4294931825 |
| 33 | 8589890772 |