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 | 19 |
| 4 | 66 |
| 5 | 244 |
| 6 | 946 |
| 7 | 3801 |
| 8 | 15697 |
| 9 | 66234 |
| 10 | 284339 |
| 11 | 1237983 |
| 12 | 5453611 |
| 13 | 24263355 |
| 14 | 108865901 |
| 15 | 492051006 |
| 16 | 2238220336 |
| 17 | 10238568080 |
| 18 | 47070014643 |
| 19 | 217363784060 |
| 20 | 1007794226777 |
| 21 | 4689545704246 |
| 22 | 21893712581740 |
| 23 | 102520882301832 |
| 24 | 481393173378979 |