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 | 38 |
| 3 | 238 |
| 4 | 1494 |
| 5 | 9374 |
| 6 | 58822 |
| 7 | 369102 |
| 8 | 2316086 |
| 9 | 14533246 |
| 10 | 91194918 |
| 11 | 572240558 |
| 12 | 3590762134 |
| 13 | 22531735134 |
| 14 | 141384772742 |
| 15 | 887177744782 |
| 16 | 5566966905846 |
| 17 | 34932256487486 |
| 18 | 219197017684198 |
| 19 | 1375443140320878 |
| 20 | 8630791843077974 |