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 | 1 |
| 2 | 11 |
| 3 | 62 |
| 4 | 367 |
| 5 | 2131 |
| 6 | 12467 |
| 7 | 72758 |
| 8 | 425003 |
| 9 | 2481842 |
| 10 | 14494425 |
| 11 | 84647239 |
| 12 | 494344466 |
| 13 | 2886987133 |
| 14 | 16860117364 |
| 15 | 98463698698 |
| 16 | 575031667957 |
| 17 | 3358206190785 |
| 18 | 19612048586036 |
| 19 | 114535089777733 |
| 20 | 668889165654501 |
| 21 | 3906337494564368 |