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 | 10 |
| 3 | 213 |
| 4 | 8284 |
| 5 | 513105 |
| 6 | 46406286 |
| 7 | 5772636373 |
| 8 | 945492503320 |
| 9 | 197253667623681 |
| 10 | 51069324556151290 |
| 11 | 16067283861476491941 |
| 12 | 6037615013420387657844 |
| 13 | 2670812587802323522405393 |
| 14 | 1373842484756310928089102022 |
| 15 | 813119045938378747809030359445 |