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 | 0 |
| 2 | 26 |
| 3 | 114 |
| 4 | 676 |
| 5 | 3734 |
| 6 | 20944 |
| 7 | 117104 |
| 8 | 655198 |
| 9 | 3665306 |
| 10 | 20505052 |
| 11 | 114711980 |
| 12 | 641737294 |
| 13 | 3590092664 |
| 14 | 20084178100 |
| 15 | 112357602542 |
| 16 | 628565969692 |
| 17 | 3516408049766 |
| 18 | 19671961528672 |
| 19 | 110051525562128 |
| 20 | 615665004273436 |