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 | 2 |
| 3 | 6 |
| 4 | 18 |
| 5 | 54 |
| 6 | 66 |
| 7 | 162 |
| 8 | 198 |
| 9 | 486 |
| 10 | 594 |
| 11 | 726 |
| 12 | 1314 |
| 13 | 1458 |
| 14 | 1782 |
| 15 | 2178 |
| 16 | 2838 |
| 17 | 3222 |
| 18 | 3942 |
| 19 | 4374 |
| 20 | 5346 |
| 21 | 5778 |
| 22 | 5874 |
| 23 | 6534 |
| 24 | 7986 |
| 25 | 8514 |
| 26 | 8646 |
| 27 | 9666 |
| 28 | 11826 |
| 29 | 13122 |
| 30 | 14454 |
| 31 | 16038 |
| 32 | 17334 |
| 33 | 17622 |
| 34 | 19602 |
| 35 | 23958 |
| 36 | 25542 |
| 37 | 25938 |
| 38 | 28998 |
| 39 | 31218 |
| 40 | 35442 |
| 41 | 35478 |
| 42 | 39366 |
| 43 | 43362 |
| 44 | 48114 |