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 | 5 |
| 2 | 11 |
| 3 | 51 |
| 4 | 161 |
| 5 | 773 |
| 6 | 3027 |
| 7 | 15395 |
| 8 | 69881 |
| 9 | 377781 |
| 10 | 1915163 |
| 11 | 10981907 |
| 12 | 60776145 |
| 13 | 368269541 |
| 14 | 2191553891 |
| 15 | 13976179203 |
| 16 | 88489011497 |
| 17 | 591631462805 |
| 18 | 3954213899691 |
| 19 | 27619472411891 |
| 20 | 193696456198913 |
| 21 | 1408953242322117 |
| 22 | 10318990227472115 |
| 23 | 77948745858933731 |