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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 24 |
| 7 | 63 |
| 8 | 150 |
| 9 | 343 |
| 10 | 746 |
| 11 | 1605 |
| 12 | 3391 |
| 13 | 7075 |
| 14 | 14624 |
| 15 | 30076 |
| 16 | 61385 |
| 17 | 124758 |
| 18 | 252618 |
| 19 | 510161 |
| 20 | 1027632 |
| 21 | 2066304 |
| 22 | 4148715 |
| 23 | 8322113 |
| 24 | 16680369 |
| 25 | 33413592 |
| 26 | 66904484 |
| 27 | 133923906 |
| 28 | 268009597 |
| 29 | 536257466 |
| 30 | 1072861536 |
| 31 | 2146225299 |
| 32 | 4293173040 |
| 33 | 8587388627 |