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) |
|---|---|
| 4 | -8 |
| 5 | -66 |
| 6 | -264 |
| 7 | -689 |
| 8 | -1255 |
| 9 | -1360 |
| 10 | 684 |
| 11 | 8502 |
| 12 | 28842 |
| 13 | 73150 |
| 14 | 159588 |
| 15 | 315549 |
| 16 | 580723 |
| 17 | 1010768 |
| 18 | 1681640 |
| 19 | 2694636 |
| 20 | 4182204 |
| 21 | 6314574 |
| 22 | 9307264 |
| 23 | 13429515 |
| 24 | 19013709 |
| 25 | 26465824 |
| 26 | 36276980 |
| 27 | 49036130 |
| 28 | 65443950 |
| 29 | 86327982 |
| 30 | 112659084 |