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 | 2 |
| 2 | 6 |
| 3 | 22 |
| 4 | 83 |
| 5 | 324 |
| 6 | 1298 |
| 7 | 5302 |
| 8 | 22002 |
| 9 | 92488 |
| 10 | 392996 |
| 11 | 1685232 |
| 12 | 7283511 |
| 13 | 31694460 |
| 14 | 138746706 |
| 15 | 610601374 |
| 16 | 2699835614 |
| 17 | 11988069480 |
| 18 | 53433418716 |
| 19 | 238986495540 |
| 20 | 1072250526558 |
| 21 | 4824638825032 |
| 22 | 21765895919444 |
| 23 | 98433111857436 |