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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 3 |
| 5 | -4 |
| 6 | -21 |
| 7 | -52 |
| 8 | -98 |
| 9 | -144 |
| 10 | -143 |
| 11 | 0 |
| 12 | 440 |
| 13 | 1368 |
| 14 | 2891 |
| 15 | 4752 |
| 16 | 5831 |
| 17 | 3438 |
| 18 | -7330 |
| 19 | -33384 |
| 20 | -81044 |
| 21 | -148610 |
| 22 | -211283 |
| 23 | -197280 |
| 24 | 39748 |
| 25 | 732646 |
| 26 | 2152660 |
| 27 | 4423184 |
| 28 | 7089816 |
| 29 | 8360270 |
| 30 | 4071395 |
| 31 | -13171888 |
| 32 | -53480919 |
| 33 | -125422768 |
| 34 | -224380607 |
| 35 | -309560644 |
| 36 | -268524883 |