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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 42 |
| 6 | 131 |
| 7 | 418 |
| 8 | 1352 |
| 9 | 4410 |
| 10 | 14463 |
| 11 | 47605 |
| 12 | 157084 |
| 13 | 519255 |
| 14 | 1718653 |
| 15 | 5693903 |
| 16 | 18877509 |
| 17 | 62620857 |
| 18 | 207816230 |
| 19 | 689899944 |
| 20 | 2290913666 |
| 21 | 7608939443 |
| 22 | 25276349558 |
| 23 | 83977959853 |
| 24 | 279039638062 |
| 25 | 927272169336 |
| 26 | 3081641953082 |