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 | 2 |
| 1 | 7 |
| 2 | 25 |
| 3 | 91 |
| 4 | 337 |
| 5 | 1267 |
| 6 | 4825 |
| 7 | 18571 |
| 8 | 72097 |
| 9 | 281827 |
| 10 | 1107625 |
| 11 | 4371451 |
| 12 | 17308657 |
| 13 | 68703187 |
| 14 | 273218425 |
| 15 | 1088090731 |
| 16 | 4338014017 |
| 17 | 17309009347 |
| 18 | 69106897225 |
| 19 | 276040168411 |
| 20 | 1102998412177 |
| 21 | 4408506864307 |
| 22 | 17623567104025 |