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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 37 |
| 7 | 123 |
| 8 | 446 |
| 9 | 1689 |
| 10 | 6693 |
| 11 | 27034 |
| 12 | 111630 |
| 13 | 467262 |
| 14 | 1981353 |
| 15 | 8487400 |
| 16 | 36695369 |
| 17 | 159918120 |
| 18 | 701957539 |
| 19 | 3101072051 |
| 20 | 13779935438 |
| 21 | 61557789660 |
| 22 | 276327463180 |
| 23 | 1245935891922 |
| 24 | 5640868033058 |
| 25 | 25635351908072 |
| 26 | 116911035023017 |