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) |
|---|---|
| 1 | 6 |
| 2 | 36 |
| 3 | 201 |
| 4 | 1096 |
| 5 | 5921 |
| 6 | 31880 |
| 7 | 171601 |
| 8 | 925176 |
| 9 | 5002641 |
| 10 | 27155800 |
| 11 | 148092161 |
| 12 | 811801256 |
| 13 | 4475004961 |
| 14 | 24813260520 |
| 15 | 138416411121 |
| 16 | 776822970136 |
| 17 | 4385905536881 |
| 18 | 24907563562040 |
| 19 | 142244725848481 |
| 20 | 816667390335816 |