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 | 3 |
| 2 | 40 |
| 3 | 284 |
| 4 | 1912 |
| 5 | 13132 |
| 6 | 88608 |
| 7 | 577727 |
| 8 | 3659416 |
| 9 | 22719964 |
| 10 | 139088248 |
| 11 | 842307548 |
| 12 | 5055782456 |
| 13 | 30119691570 |
| 14 | 178296516264 |
| 15 | 1049685801023 |
| 16 | 6150604755800 |
| 17 | 35890214413836 |
| 18 | 208663068856540 |
| 19 | 1209212316951436 |
| 20 | 6987073893141896 |
| 21 | 40267076160162015 |
| 22 | 231512818498197668 |