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 | 8 |
| 2 | 67 |
| 3 | 576 |
| 4 | 5036 |
| 5 | 44552 |
| 6 | 397594 |
| 7 | 3572224 |
| 8 | 32267668 |
| 9 | 292750368 |
| 10 | 2665685155 |
| 11 | 24347665728 |
| 12 | 222972599812 |
| 13 | 2046626681072 |
| 14 | 18823260696452 |
| 15 | 173427623923712 |
| 16 | 1600383346290116 |
| 17 | 14789063407109600 |
| 18 | 136838247669241276 |
| 19 | 1267571539176770816 |
| 20 | 11754134090271100336 |