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) |
|---|---|
| 11 | 2 |
| 12 | 6 |
| 13 | 21 |
| 14 | 63 |
| 15 | 185 |
| 16 | 512 |
| 17 | 1403 |
| 18 | 3750 |
| 19 | 9928 |
| 20 | 25969 |
| 21 | 67462 |
| 22 | 174039 |
| 23 | 446884 |
| 24 | 1142457 |
| 25 | 2911078 |
| 26 | 7396049 |
| 27 | 18746761 |
| 28 | 47420345 |
| 29 | 119746936 |
| 30 | 301941284 |
| 31 | 760387426 |
| 32 | 1912814031 |
| 33 | 4807298905 |
| 34 | 12071798139 |
| 35 | 30292240853 |
| 36 | 75965728619 |
| 37 | 190398931985 |
| 38 | 476980247827 |
| 39 | 1194401725174 |