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 | 6 |
| 3 | 13 |
| 4 | 24 |
| 5 | 52 |
| 6 | 103 |
| 7 | 222 |
| 8 | 384 |
| 9 | 832 |
| 10 | 1648 |
| 11 | 3552 |
| 12 | 6237 |
| 13 | 13563 |
| 14 | 26511 |
| 15 | 56906 |
| 16 | 98304 |
| 17 | 212992 |
| 18 | 421888 |
| 19 | 909312 |
| 20 | 1596672 |
| 21 | 3472128 |
| 22 | 6786816 |
| 23 | 14567936 |
| 24 | 25190110 |
| 25 | 54589881 |
| 26 | 108036850 |
| 27 | 232800673 |
| 28 | 408783316 |
| 29 | 888883132 |