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 | 2 |
| 1 | 4 |
| 2 | 11 |
| 3 | 33 |
| 4 | 105 |
| 5 | 363 |
| 6 | 1449 |
| 7 | 7227 |
| 8 | 46881 |
| 9 | 382563 |
| 10 | 3687849 |
| 11 | 40093947 |
| 12 | 479533041 |
| 13 | 6228615123 |
| 14 | 87183074169 |
| 15 | 1307688716907 |
| 16 | 20922832934721 |
| 17 | 355687557236163 |
| 18 | 6402374093148489 |
| 19 | 121645101571093467 |
| 20 | 2432902011663424401 |
| 21 | 51090942182169793203 |
| 22 | 1124000727808988739609 |