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 | 4 |
| 1 | 128 |
| 2 | 3072 |
| 3 | 65536 |
| 4 | 1310720 |
| 5 | 25165824 |
| 6 | 469762048 |
| 7 | 8589934592 |
| 8 | 154618822656 |
| 9 | 2748779069440 |
| 10 | 48378511622144 |
| 11 | 844424930131968 |
| 12 | 14636698788954112 |
| 13 | 252201579132747776 |
| 14 | 4323455642275676160 |
| 15 | 73786976294838206464 |
| 16 | 1254378597012249509888 |
| 17 | 21250649172913403461632 |