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 | 13 |
| 3 | 82 |
| 4 | 406 |
| 5 | 1809 |
| 6 | 7659 |
| 7 | 31588 |
| 8 | 128476 |
| 9 | 518611 |
| 10 | 2084809 |
| 11 | 8361918 |
| 12 | 33497010 |
| 13 | 134094757 |
| 14 | 536608663 |
| 15 | 2146926472 |
| 16 | 8588754808 |
| 17 | 34357247847 |
| 18 | 137433710421 |
| 19 | 549744803650 |
| 20 | 2199000186670 |
| 21 | 8796044787481 |
| 22 | 35184271425283 |