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 | 6 |
| 2 | 47 |
| 3 | 446 |
| 4 | 4929 |
| 5 | 61870 |
| 6 | 866695 |
| 7 | 13373190 |
| 8 | 224995745 |
| 9 | 4094022230 |
| 10 | 80031878175 |
| 11 | 1671426609550 |
| 12 | 37116087808225 |
| 13 | 872797202471550 |
| 14 | 21656891639499575 |
| 15 | 565266064058561750 |
| 16 | 15476777687220818625 |
| 17 | 443409439715399299750 |
| 18 | 13263588837009155407375 |