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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 2 |
| 5 | 10 |
| 6 | 16 |
| 7 | 52 |
| 8 | 104 |
| 9 | 286 |
| 10 | 634 |
| 11 | 1622 |
| 12 | 3768 |
| 13 | 9336 |
| 14 | 22152 |
| 15 | 54106 |
| 16 | 129610 |
| 17 | 314546 |
| 18 | 756728 |
| 19 | 1831196 |
| 20 | 4413952 |
| 21 | 10667462 |
| 22 | 25735346 |
| 23 | 62160046 |
| 24 | 150020016 |
| 25 | 362257392 |
| 26 | 874442064 |
| 27 | 2111291570 |
| 28 | 5096782418 |
| 29 | 12305249242 |
| 30 | 29706645280 |
| 31 | 71719568260 |