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 | 8 |
| 2 | 61 |
| 3 | 467 |
| 4 | 3574 |
| 5 | 27353 |
| 6 | 209341 |
| 7 | 1602152 |
| 8 | 12261769 |
| 9 | 93843143 |
| 10 | 718210846 |
| 11 | 5496691637 |
| 12 | 42067895689 |
| 13 | 321958728008 |
| 14 | 2464050574501 |
| 15 | 18858147661547 |
| 16 | 144327286503334 |
| 17 | 1104581743831073 |
| 18 | 8453708639334181 |
| 19 | 64698869194494632 |
| 20 | 495160627558133329 |
| 21 | 3789618738879406463 |