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 | 4 |
| 2 | 8 |
| 3 | 32 |
| 4 | 128 |
| 5 | 2160 |
| 6 | 8192 |
| 7 | 131072 |
| 8 | 524288 |
| 9 | 8567136 |
| 10 | 539922240 |
| 11 | 2147483648 |
| 12 | 138055271872 |
| 13 | 2199187780272 |
| 14 | 8817412930560 |
| 15 | 140828559963840 |
| 16 | 9008745449302368 |
| 17 | 576463955735383776 |
| 18 | 2305843009213693952 |
| 19 | 147573953351708377936 |
| 20 | 2361193635521975063040 |