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 | 42 |
| 6 | 126 |
| 7 | 162 |
| 8 | 378 |
| 9 | 486 |
| 10 | 882 |
| 11 | 1458 |
| 12 | 2646 |
| 13 | 3078 |
| 14 | 3942 |
| 15 | 5418 |
| 16 | 9198 |
| 17 | 11826 |
| 18 | 14406 |
| 19 | 16758 |
| 20 | 18522 |
| 21 | 24966 |
| 22 | 26406 |
| 23 | 37338 |
| 24 | 39366 |
| 25 | 42462 |
| 26 | 71442 |
| 27 | 77658 |
| 28 | 95922 |
| 29 | 99078 |
| 30 | 113778 |
| 31 | 117306 |
| 32 | 143262 |
| 33 | 174762 |
| 34 | 175446 |
| 35 | 184842 |
| 36 | 265482 |
| 37 | 304038 |
| 38 | 308826 |
| 39 | 318402 |
| 40 | 351918 |