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 | -4 |
| 2 | 6 |
| 3 | -8 |
| 4 | 17 |
| 5 | -28 |
| 6 | 38 |
| 7 | -56 |
| 8 | 84 |
| 9 | -124 |
| 10 | 172 |
| 11 | -232 |
| 12 | 325 |
| 13 | -448 |
| 14 | 594 |
| 15 | -784 |
| 16 | 1049 |
| 17 | -1388 |
| 18 | 1796 |
| 19 | -2320 |
| 20 | 3005 |
| 21 | -3864 |
| 22 | 4912 |
| 23 | -6216 |
| 24 | 7877 |
| 25 | -9940 |
| 26 | 12430 |
| 27 | -15488 |
| 28 | 19309 |
| 29 | -23972 |
| 30 | 29580 |
| 31 | -36408 |
| 32 | 44766 |
| 33 | -54876 |
| 34 | 66978 |
| 35 | -81536 |
| 36 | 99150 |
| 37 | -120272 |
| 38 | 145374 |
| 39 | -175344 |
| 40 | 211242 |