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) |
|---|---|
| 12 | 1 |
| 13 | 5 |
| 14 | 30 |
| 15 | 151 |
| 16 | 698 |
| 17 | 2896 |
| 18 | 11053 |
| 19 | 38865 |
| 20 | 127339 |
| 21 | 390781 |
| 22 | 1131055 |
| 23 | 3102493 |
| 24 | 8105244 |
| 25 | 20247770 |
| 26 | 48548878 |
| 27 | 112089790 |
| 28 | 249930985 |
| 29 | 539592972 |
| 30 | 1130655414 |
| 31 | 2304230739 |
| 32 | 4575993619 |
| 33 | 8870692319 |
| 34 | 16812222795 |
| 35 | 31196614962 |
| 36 | 56750633235 |