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 | 3 |
| 3 | 11 |
| 4 | 44 |
| 5 | 186 |
| 6 | 810 |
| 7 | 3582 |
| 8 | 15952 |
| 9 | 71242 |
| 10 | 318441 |
| 11 | 1423411 |
| 12 | 6360809 |
| 13 | 28415254 |
| 14 | 126900911 |
| 15 | 566604462 |
| 16 | 2529439891 |
| 17 | 11290673434 |
| 18 | 50394458326 |
| 19 | 224918228462 |
| 20 | 1003813933351 |
| 21 | 4479953995624 |
| 22 | 19993503244811 |
| 23 | 89228022987483 |
| 24 | 398209768217607 |