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 | 6 |
| 4 | 13 |
| 5 | 22 |
| 6 | 64 |
| 7 | 155 |
| 8 | 321 |
| 9 | 783 |
| 10 | 1888 |
| 11 | 4233 |
| 12 | 9912 |
| 13 | 23494 |
| 14 | 54177 |
| 15 | 126019 |
| 16 | 295681 |
| 17 | 687690 |
| 18 | 1600185 |
| 19 | 3738332 |
| 20 | 8712992 |
| 21 | 20293761 |
| 22 | 47337405 |
| 23 | 110368563 |
| 24 | 257206012 |
| 25 | 599684007 |
| 26 | 1398149988 |
| 27 | 3259051800 |
| 28 | 7597720649 |
| 29 | 17712981963 |