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 | 9 |
| 2 | 45 |
| 3 | 117 |
| 4 | 565 |
| 5 | 1953 |
| 6 | 9153 |
| 7 | 37269 |
| 8 | 173409 |
| 9 | 766869 |
| 10 | 3589357 |
| 11 | 16545861 |
| 12 | 78195505 |
| 13 | 368573829 |
| 14 | 1757922765 |
| 15 | 8394885777 |
| 16 | 40340645213 |
| 17 | 194259462205 |
| 18 | 938930726781 |
| 19 | 4547344031581 |
| 20 | 22077243778089 |
| 21 | 107366485176765 |
| 22 | 523060579628697 |