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 | 81 |
| 3 | 287 |
| 4 | 987 |
| 5 | 2884 |
| 6 | 7165 |
| 7 | 17929 |
| 8 | 40646 |
| 9 | 90602 |
| 10 | 196548 |
| 11 | 412733 |
| 12 | 859077 |
| 13 | 1751887 |
| 14 | 3532169 |
| 15 | 7052859 |
| 16 | 13932019 |
| 17 | 27335037 |
| 18 | 53236611 |
| 19 | 103050502 |
| 20 | 198448577 |
| 21 | 380245761 |
| 22 | 725544748 |
| 23 | 1379004108 |
| 24 | 2611731954 |
| 25 | 4930796893 |
| 26 | 9281596371 |