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 | 1 |
| 5 | 1 |
| 6 | -1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 3 |
| 11 | 5 |
| 12 | 10 |
| 13 | 10 |
| 14 | 38 |
| 15 | 48 |
| 16 | 85 |
| 17 | 157 |
| 18 | 280 |
| 19 | 477 |
| 20 | 900 |
| 21 | 1540 |
| 22 | 2894 |
| 23 | 5464 |
| 24 | 9762 |
| 25 | 18132 |
| 26 | 33450 |
| 27 | 62364 |
| 28 | 116657 |
| 29 | 217500 |
| 30 | 407235 |
| 31 | 763246 |
| 32 | 1432291 |
| 33 | 2698847 |
| 34 | 5087838 |
| 35 | 9620802 |
| 36 | 18210979 |
| 37 | 34487702 |
| 38 | 65417618 |
| 39 | 124353014 |
| 40 | 236558508 |