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) |
|---|---|
| 5 | 1 |
| 6 | 5 |
| 7 | 29 |
| 8 | 127 |
| 9 | 540 |
| 10 | 2117 |
| 11 | 8063 |
| 12 | 29688 |
| 13 | 107237 |
| 14 | 380549 |
| 15 | 1333709 |
| 16 | 4624308 |
| 17 | 15899625 |
| 18 | 54278502 |
| 19 | 184209808 |
| 20 | 622029353 |
| 21 | 2091461574 |
| 22 | 7006165827 |
| 23 | 23394683289 |
| 24 | 77899483723 |
| 25 | 258750654760 |
| 26 | 857596024194 |
| 27 | 2836911700038 |
| 28 | 9368339478043 |
| 29 | 30889646001696 |
| 30 | 101710568454396 |