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 | 145 |
| 4 | 2755 |
| 5 | 64660 |
| 6 | 1804705 |
| 7 | 58336855 |
| 8 | 2141867440 |
| 9 | 87998832685 |
| 10 | 3998289746065 |
| 11 | 198991311832840 |
| 12 | 10762795518750121 |
| 13 | 628439018694857887 |
| 14 | 39390402253060922833 |
| 15 | 2637469071097179922603 |
| 16 | 187848412983167698626469 |
| 17 | 14178423030415044515701642 |