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 | -1 |
| 2 | -2 |
| 3 | -4 |
| 4 | 0 |
| 5 | 3 |
| 6 | 17 |
| 7 | 24 |
| 8 | 40 |
| 9 | 9 |
| 10 | -24 |
| 11 | -149 |
| 12 | -250 |
| 13 | -435 |
| 14 | -395 |
| 15 | -281 |
| 16 | 514 |
| 17 | 1528 |
| 18 | 3542 |
| 19 | 5127 |
| 20 | 6920 |
| 21 | 5416 |
| 22 | 1368 |
| 23 | -11136 |
| 24 | -28533 |
| 25 | -57051 |
| 26 | -82846 |
| 27 | -107315 |
| 28 | -95655 |
| 29 | -43646 |
| 30 | 107826 |
| 31 | 345877 |
| 32 | 727771 |
| 33 | 1150968 |
| 34 | 1601729 |
| 35 | 1766547 |
| 36 | 1495154 |
| 37 | 183944 |
| 38 | -2339567 |
| 39 | -6770991 |
| 40 | -12701854 |