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 | 11 |
| 2 | 46 |
| 3 | 182 |
| 4 | 1026 |
| 5 | 4836 |
| 6 | 23922 |
| 7 | 118674 |
| 8 | 584516 |
| 9 | 2889306 |
| 10 | 14266546 |
| 11 | 70455052 |
| 12 | 347980122 |
| 13 | 1718525298 |
| 14 | 8487343508 |
| 15 | 41916544250 |
| 16 | 207013446378 |
| 17 | 1022380190332 |
| 18 | 5049238367202 |
| 19 | 24936725579450 |
| 20 | 123155267567884 |
| 21 | 608228181611074 |
| 22 | 3003862808227186 |
| 23 | 14835208208589988 |