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 | 2097152 |
| 1 | 1280000000 |
| 2 | 34359738368 |
| 3 | 319277809664 |
| 4 | 1727094849536 |
| 5 | 6722988818432 |
| 6 | 20971520000000 |
| 7 | 55784660123648 |
| 8 | 131593177923584 |
| 9 | 282621973446656 |
| 10 | 562949953421312 |
| 11 | 1054135040000000 |
| 12 | 1874584905187328 |