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 | 4 |
| 1 | 42 |
| 2 | 850 |
| 3 | 19782 |
| 4 | 485554 |
| 5 | 12252702 |
| 6 | 313742650 |
| 7 | 8094558822 |
| 8 | 209642795554 |
| 9 | 5440108178862 |
| 10 | 141304954146250 |
| 11 | 3672136647383862 |
| 12 | 95452254746808754 |
| 13 | 2481455748310337022 |
| 14 | 64513912079682866650 |
| 15 | 1677310528178740048902 |
| 16 | 43609408316038057305154 |