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 | 6 |
| 2 | 36 |
| 3 | 102 |
| 4 | 279 |
| 5 | 741 |
| 6 | 1995 |
| 7 | 5404 |
| 8 | 14555 |
| 9 | 39180 |
| 10 | 105688 |
| 11 | 284961 |
| 12 | 767907 |
| 13 | 2070021 |
| 14 | 5580470 |
| 15 | 15042195 |
| 16 | 40547128 |
| 17 | 109300950 |
| 18 | 294632265 |
| 19 | 794208105 |
| 20 | 2140875657 |
| 21 | 5770963528 |
| 22 | 15556228121 |
| 23 | 41933454712 |
| 24 | 113036097920 |
| 25 | 304700733021 |