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 | 1 |
| 4 | 7 |
| 5 | 19 |
| 6 | 37 |
| 7 | 61 |
| 8 | 145 |
| 9 | 397 |
| 10 | 979 |
| 11 | 2107 |
| 12 | 4591 |
| 13 | 10915 |
| 14 | 26857 |
| 15 | 63649 |
| 16 | 146347 |
| 17 | 339751 |
| 18 | 808885 |
| 19 | 1936717 |
| 20 | 4588705 |
| 21 | 10803133 |
| 22 | 25559287 |
| 23 | 60893551 |
| 24 | 145231309 |
| 25 | 345462145 |
| 26 | 821110051 |
| 27 | 1955736379 |
| 28 | 4668132067 |
| 29 | 11146642903 |
| 30 | 26605635949 |