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 | 1 |
| 2 | 0 |
| 3 | 3 |
| 4 | 0 |
| 5 | 10 |
| 6 | 0 |
| 7 | 35 |
| 8 | 1 |
| 9 | 126 |
| 10 | 11 |
| 11 | 462 |
| 12 | 78 |
| 13 | 1716 |
| 14 | 455 |
| 15 | 6435 |
| 16 | 2380 |
| 17 | 24311 |
| 18 | 11628 |
| 19 | 92398 |
| 20 | 54264 |
| 21 | 352947 |
| 22 | 245157 |
| 23 | 1354102 |
| 24 | 1081575 |
| 25 | 5215250 |
| 26 | 4686826 |
| 27 | 20156580 |
| 28 | 20030039 |
| 29 | 78152535 |
| 30 | 84672780 |
| 31 | 303906051 |
| 32 | 354822776 |
| 33 | 1184959314 |
| 34 | 1476390160 |