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 | 1 |
| 3 | 5 |
| 4 | 22 |
| 5 | 116 |
| 6 | 612 |
| 7 | 3399 |
| 8 | 19228 |
| 9 | 111041 |
| 10 | 650325 |
| 11 | 3856892 |
| 12 | 23107896 |
| 13 | 139672312 |
| 14 | 850624376 |
| 15 | 5214734547 |
| 16 | 32154708216 |
| 17 | 199292232035 |
| 18 | 1240877862315 |
| 19 | 7758138260565 |
| 20 | 48685766617950 |
| 21 | 306558216362064 |
| 22 | 1936246229757840 |
| 23 | 12263985131919300 |
| 24 | 77880114240872112 |