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 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 215 |
| 4 | 13544 |
| 5 | 1646568 |
| 6 | 342128448 |
| 7 | 111806434449 |
| 8 | 54089613731960 |
| 9 | 36991616761628936 |
| 10 | 34487632073741256512 |
| 11 | 42564197996724997147672 |
| 12 | 67876867685905911079322176 |
| 13 | 137043021921732373141812704320 |
| 14 | 344286933629331983612822165758464 |
| 15 | 1060279482920092978432461141783224583 |