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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 93 |
| 6 | 437 |
| 7 | 2233 |
| 8 | 12227 |
| 9 | 71011 |
| 10 | 434151 |
| 11 | 2778424 |
| 12 | 18530560 |
| 13 | 128351696 |
| 14 | 920714033 |
| 15 | 6824472471 |
| 16 | 52169690544 |
| 17 | 410668022430 |
| 18 | 3324392442855 |
| 19 | 27643496374175 |
| 20 | 235891305666644 |
| 21 | 2063970414061799 |
| 22 | 18503192136038026 |
| 23 | 169846619393391680 |
| 24 | 1595434723902554826 |