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) |
|---|---|
| 3 | 1 |
| 4 | 11 |
| 5 | 75 |
| 6 | 496 |
| 7 | 2523 |
| 8 | 14903 |
| 9 | 68478 |
| 10 | 389040 |
| 11 | 1705001 |
| 12 | 9552071 |
| 13 | 40792260 |
| 14 | 227758442 |
| 15 | 957346363 |
| 16 | 5353798598 |
| 17 | 22267534284 |
| 18 | 125033595506 |
| 19 | 516148089100 |
| 20 | 2913354375795 |
| 21 | 11958933491775 |
| 22 | 67884893610121 |
| 23 | 277431526202759 |
| 24 | 1583886793301326 |
| 25 | 6449958580342975 |
| 26 | 37029044240499120 |