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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 114 |
| 9 | 278 |
| 10 | 676 |
| 11 | 1653 |
| 12 | 4027 |
| 13 | 9816 |
| 14 | 23843 |
| 15 | 57833 |
| 16 | 139908 |
| 17 | 337856 |
| 18 | 814127 |
| 19 | 1958524 |
| 20 | 4703322 |
| 21 | 11278027 |
| 22 | 27003707 |
| 23 | 64571463 |
| 24 | 154207616 |
| 25 | 367841733 |
| 26 | 876450881 |
| 27 | 2086098057 |
| 28 | 4960230005 |
| 29 | 11782852600 |
| 30 | 27963874395 |
| 31 | 66307010599 |