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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 27 |
| 5 | 91 |
| 6 | 439 |
| 7 | 1807 |
| 8 | 9059 |
| 9 | 41803 |
| 10 | 214231 |
| 11 | 1037719 |
| 12 | 5460691 |
| 13 | 27297739 |
| 14 | 145340511 |
| 15 | 746123815 |
| 16 | 4011076915 |
| 17 | 20927156707 |
| 18 | 113608631567 |
| 19 | 600318853927 |
| 20 | 3279271467435 |
| 21 | 17524510115443 |
| 22 | 96226513851535 |
| 23 | 518431875418927 |
| 24 | 2861594917241083 |
| 25 | 15521473553775091 |