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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 49 |
| 6 | 146 |
| 7 | 437 |
| 8 | 1312 |
| 9 | 3937 |
| 10 | 11810 |
| 11 | 35429 |
| 12 | 106288 |
| 13 | 318865 |
| 14 | 956594 |
| 15 | 2869781 |
| 16 | 8609344 |
| 17 | 25828033 |
| 18 | 77484098 |
| 19 | 232452293 |
| 20 | 697356880 |
| 21 | 2092070641 |
| 22 | 6276211922 |
| 23 | 18828635765 |
| 24 | 56485907296 |
| 25 | 169457721889 |
| 26 | 508373165666 |
| 27 | 1525119496997 |
| 28 | 4575358490992 |
| 29 | 13726075472977 |