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) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 40 |
| 4 | 216 |
| 5 | 1144 |
| 6 | 6016 |
| 7 | 31552 |
| 8 | 165312 |
| 9 | 865792 |
| 10 | 4533760 |
| 11 | 23739904 |
| 12 | 124305408 |
| 13 | 650874880 |
| 14 | 3408031744 |
| 15 | 17844699136 |
| 16 | 93436084224 |
| 17 | 489237741568 |
| 18 | 2561682178048 |
| 19 | 13413142233088 |
| 20 | 70232124948480 |
| 21 | 367740181282816 |
| 22 | 1925512588951552 |
| 23 | 10082114810675200 |
| 24 | 52790638512439296 |