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 | 12 |
| 2 | 42 |
| 3 | 162 |
| 4 | 642 |
| 5 | 2562 |
| 6 | 10242 |
| 7 | 40962 |
| 8 | 163842 |
| 9 | 655362 |
| 10 | 2621442 |
| 11 | 10485762 |
| 12 | 41943042 |
| 13 | 167772162 |
| 14 | 671088642 |
| 15 | 2684354562 |
| 16 | 10737418242 |
| 17 | 42949672962 |
| 18 | 171798691842 |
| 19 | 687194767362 |
| 20 | 2748779069442 |
| 21 | 10995116277762 |
| 22 | 43980465111042 |
| 23 | 175921860444162 |
| 24 | 703687441776642 |