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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 0 |
| 6 | 4 |
| 7 | 8 |
| 8 | 4 |
| 9 | 22 |
| 10 | 66 |
| 11 | 66 |
| 12 | 162 |
| 13 | 560 |
| 14 | 840 |
| 15 | 1529 |
| 16 | 4985 |
| 17 | 9690 |
| 18 | 16774 |
| 19 | 47349 |
| 20 | 107229 |
| 21 | 195500 |
| 22 | 483000 |
| 23 | 1172724 |
| 24 | 2311516 |
| 25 | 5249556 |
| 26 | 12910716 |
| 27 | 27299992 |
| 28 | 59765400 |
| 29 | 144602352 |
| 30 | 321554224 |
| 31 | 700449496 |
| 32 | 1654540452 |
| 33 | 3789265198 |
| 34 | 8344514618 |
| 35 | 19327204006 |