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 | 3 |
| 2 | 6 |
| 3 | 10 |
| 4 | 36 |
| 5 | 144 |
| 6 | 706 |
| 7 | 3774 |
| 8 | 22140 |
| 9 | 137096 |
| 10 | 888522 |
| 11 | 5950434 |
| 12 | 40936518 |
| 13 | 287748366 |
| 14 | 2059386024 |
| 15 | 14964163584 |
| 16 | 110160504906 |
| 17 | 820172543046 |
| 18 | 6167144620494 |
| 19 | 46780206203250 |
| 20 | 357620668556700 |
| 21 | 2753050958956812 |
| 22 | 21327412744225182 |
| 23 | 166164346278018822 |
| 24 | 1301341878493196986 |