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 | 4 |
| 2 | 10 |
| 3 | 29 |
| 4 | 97 |
| 5 | 366 |
| 6 | 1534 |
| 7 | 7049 |
| 8 | 35129 |
| 9 | 187993 |
| 10 | 1069914 |
| 11 | 6413136 |
| 12 | 40104257 |
| 13 | 259358085 |
| 14 | 1721368017 |
| 15 | 11650893890 |
| 16 | 80015045418 |
| 17 | 555433766065 |
| 18 | 3885803906493 |
| 19 | 27339242339942 |
| 20 | 193138394368496 |
| 21 | 1368463903086546 |
| 22 | 9716805805575427 |