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 | 9 |
| 3 | 24 |
| 4 | 57 |
| 5 | 182 |
| 6 | 535 |
| 7 | 1513 |
| 8 | 4415 |
| 9 | 12832 |
| 10 | 37110 |
| 11 | 107661 |
| 12 | 312229 |
| 13 | 904915 |
| 14 | 2623749 |
| 15 | 7607302 |
| 16 | 22054261 |
| 17 | 63940404 |
| 18 | 185379485 |
| 19 | 537454173 |
| 20 | 1558199157 |
| 21 | 4517574360 |
| 22 | 13097454856 |
| 23 | 37972451701 |
| 24 | 110090662857 |
| 25 | 319177485549 |
| 26 | 925367027389 |