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 | 1163085 |
| 2 | 5835060 |
| 3 | 21482340 |
| 4 | 74471760 |
| 5 | 222185304 |
| 6 | 612903720 |
| 7 | 1469224350 |
| 8 | 3164268690 |
| 9 | 5762811670 |
| 10 | 9538994388 |
| 11 | 13513772745 |
| 12 | 18112131840 |
| 13 | 20675910420 |
| 14 | 23653643310 |
| 15 | 22677991578 |
| 16 | 22923998460 |
| 17 | 19287053775 |
| 18 | 17554312490 |
| 19 | 13495597225 |
| 20 | 11143736604 |
| 21 | 8029798920 |
| 22 | 6035010960 |
| 23 | 4254456690 |
| 24 | 2872892550 |
| 25 | 1924619235 |
| 26 | 1215058680 |
| 27 | 789847190 |