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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 18 |
| 3 | 55 |
| 4 | 149 |
| 5 | 360 |
| 6 | 757 |
| 7 | 1265 |
| 8 | 1026 |
| 9 | -3725 |
| 10 | -25807 |
| 11 | -102960 |
| 12 | -334151 |
| 13 | -950035 |
| 14 | -2411118 |
| 15 | -5405345 |
| 16 | -10148899 |
| 17 | -12907080 |
| 18 | 6506893 |
| 19 | 122884025 |
| 20 | 568871874 |
| 21 | 1984171195 |
| 22 | 5938752857 |
| 23 | 15804565920 |
| 24 | 37451559601 |
| 25 | 76625836565 |
| 26 | 120968265618 |
| 27 | 68460472135 |
| 28 | -504475498651 |