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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 5 |
| 7 | 20 |
| 8 | 69 |
| 9 | 200 |
| 10 | 521 |
| 11 | 1294 |
| 12 | 3126 |
| 13 | 7364 |
| 14 | 17309 |
| 15 | 40577 |
| 16 | 95460 |
| 17 | 224971 |
| 18 | 531368 |
| 19 | 1252664 |
| 20 | 2943095 |
| 21 | 6870029 |
| 22 | 15911618 |
| 23 | 36507381 |
| 24 | 82930347 |
| 25 | 186414619 |
| 26 | 414654766 |
| 27 | 912766795 |
| 28 | 1989007381 |
| 29 | 4292038414 |
| 30 | 9175624264 |
| 31 | 19442250125 |
| 32 | 40851448761 |
| 33 | 85157787033 |
| 34 | 176200110937 |