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 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 40 |
| 5 | 99 |
| 6 | 246 |
| 7 | 642 |
| 8 | 1690 |
| 9 | 4554 |
| 10 | 12436 |
| 11 | 34132 |
| 12 | 95230 |
| 13 | 263934 |
| 14 | 744956 |
| 15 | 2075132 |
| 16 | 5892430 |
| 17 | 16456014 |
| 18 | 46871196 |
| 19 | 131068572 |
| 20 | 373897870 |
| 21 | 1046231694 |
| 22 | 2986898716 |
| 23 | 8360588572 |
| 24 | 23878057870 |
| 25 | 66847653774 |
| 26 | 190955945756 |
| 27 | 534633021212 |
| 28 | 1527373517710 |
| 29 | 4276471354254 |