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 | 3 |
| 2 | 6 |
| 3 | 6 |
| 4 | 16 |
| 5 | 39 |
| 6 | 114 |
| 7 | 335 |
| 8 | 1081 |
| 9 | 3574 |
| 10 | 12408 |
| 11 | 44076 |
| 12 | 160915 |
| 13 | 598244 |
| 14 | 2263400 |
| 15 | 8681464 |
| 16 | 33713947 |
| 17 | 132305267 |
| 18 | 524095596 |
| 19 | 2093208435 |
| 20 | 8422013745 |
| 21 | 34110403728 |
| 22 | 138979989162 |
| 23 | 569339728312 |
| 24 | 2343898451275 |
| 25 | 9693334574919 |