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 | 81 |
| 2 | 405 |
| 3 | 1215 |
| 4 | 2835 |
| 5 | 5670 |
| 6 | 10206 |
| 7 | 17010 |
| 8 | 26730 |
| 9 | 40095 |
| 10 | 57915 |
| 11 | 81081 |
| 12 | 110565 |
| 13 | 147420 |
| 14 | 192780 |
| 15 | 247860 |
| 16 | 313956 |
| 17 | 392445 |
| 18 | 484785 |
| 19 | 592515 |
| 20 | 717255 |
| 21 | 860706 |
| 22 | 1024650 |
| 23 | 1210950 |
| 24 | 1421550 |
| 25 | 1658475 |
| 26 | 1923831 |
| 27 | 2219805 |
| 28 | 2548665 |
| 29 | 2912760 |
| 30 | 3314520 |
| 31 | 3756456 |
| 32 | 4241160 |
| 33 | 4771305 |
| 34 | 5349645 |