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 | 15 |
| 3 | 81 |
| 4 | 281 |
| 5 | 756 |
| 6 | 1722 |
| 7 | 3486 |
| 8 | 6462 |
| 9 | 11187 |
| 10 | 18337 |
| 11 | 28743 |
| 12 | 43407 |
| 13 | 63518 |
| 14 | 90468 |
| 15 | 125868 |
| 16 | 171564 |
| 17 | 229653 |
| 18 | 302499 |
| 19 | 392749 |
| 20 | 503349 |
| 21 | 637560 |
| 22 | 798974 |
| 23 | 991530 |
| 24 | 1219530 |
| 25 | 1487655 |
| 26 | 1800981 |
| 27 | 2164995 |
| 28 | 2585611 |
| 29 | 3069186 |
| 30 | 3622536 |
| 31 | 4252952 |