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 | 1 |
| 4 | 3 |
| 5 | 12 |
| 6 | 28 |
| 7 | 81 |
| 8 | 177 |
| 9 | 410 |
| 10 | 906 |
| 11 | 1869 |
| 12 | 4001 |
| 13 | 8094 |
| 14 | 16032 |
| 15 | 32355 |
| 16 | 62499 |
| 17 | 120078 |
| 18 | 227880 |
| 19 | 436743 |
| 20 | 805797 |
| 21 | 1487920 |
| 22 | 2751618 |
| 23 | 5017143 |
| 24 | 9063625 |
| 25 | 16153560 |
| 26 | 29066676 |
| 27 | 51334289 |
| 28 | 90784671 |
| 29 | 157941132 |
| 30 | 275244344 |
| 31 | 478874505 |
| 32 | 823848357 |
| 33 | 1412686722 |
| 34 | 2400778830 |
| 35 | 4091929101 |