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 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 192 |
| 4 | 2048 |
| 5 | 20480 |
| 6 | 196608 |
| 7 | 1835008 |
| 8 | 16777216 |
| 9 | 150994944 |
| 10 | 1342177280 |
| 11 | 11811160064 |
| 12 | 103079215104 |
| 13 | 893353197568 |
| 14 | 7696581394432 |
| 15 | 65970697666560 |
| 16 | 562949953421312 |
| 17 | 4785074604081152 |
| 18 | 40532396646334464 |
| 19 | 342273571680157696 |
| 20 | 2882303761517117440 |
| 21 | 24211351596743786496 |