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 | 3 |
| 4 | 3 |
| 5 | 3 |
| 6 | 12 |
| 7 | 21 |
| 8 | 30 |
| 9 | 66 |
| 10 | 129 |
| 11 | 219 |
| 12 | 417 |
| 13 | 804 |
| 14 | 1461 |
| 15 | 2712 |
| 16 | 5124 |
| 17 | 9507 |
| 18 | 17643 |
| 19 | 33015 |
| 20 | 61536 |
| 21 | 114465 |
| 22 | 213510 |
| 23 | 398118 |
| 24 | 741513 |
| 25 | 1382043 |
| 26 | 2576397 |
| 27 | 4800936 |
| 28 | 8947065 |
| 29 | 16676256 |
| 30 | 31079064 |
| 31 | 57920259 |
| 32 | 107949027 |
| 33 | 201186219 |
| 34 | 374946996 |