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 | 1 |
| 3 | 2 |
| 4 | -2 |
| 5 | -4 |
| 6 | -11 |
| 7 | -22 |
| 8 | -14 |
| 9 | -28 |
| 10 | 58 |
| 11 | 116 |
| 12 | 316 |
| 13 | 632 |
| 14 | 397 |
| 15 | 794 |
| 16 | -2198 |
| 17 | -4396 |
| 18 | -11954 |
| 19 | -23908 |
| 20 | -14684 |
| 21 | -29368 |
| 22 | 95170 |
| 23 | 190340 |
| 24 | 517492 |
| 25 | 1034984 |
| 26 | 623764 |
| 27 | 1247528 |
| 28 | -4462472 |
| 29 | -8924944 |
| 30 | -24270275 |
| 31 | -48540550 |
| 32 | -28820966 |
| 33 | -57641932 |
| 34 | 220608454 |
| 35 | 441216908 |
| 36 | 1200216340 |