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 | 12 |
| 2 | 144 |
| 3 | 396 |
| 4 | 1989 |
| 5 | 6513 |
| 6 | 15789 |
| 7 | 54208 |
| 8 | 182081 |
| 9 | 515760 |
| 10 | 1608288 |
| 11 | 5222049 |
| 12 | 15774129 |
| 13 | 48430957 |
| 14 | 153161876 |
| 15 | 472757845 |
| 16 | 1455155232 |
| 17 | 4543272108 |
| 18 | 14099458893 |
| 19 | 43567325145 |
| 20 | 135359672373 |
| 21 | 420297279776 |
| 22 | 1301704097801 |
| 23 | 4038233202624 |