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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 1 |
| 7 | -3 |
| 8 | 5 |
| 9 | -3 |
| 10 | 1 |
| 11 | 1 |
| 12 | -5 |
| 13 | 13 |
| 14 | -17 |
| 15 | 13 |
| 16 | -5 |
| 17 | 1 |
| 18 | 1 |
| 19 | -9 |
| 20 | 41 |
| 21 | -109 |
| 22 | 191 |
| 23 | -229 |
| 24 | 191 |
| 25 | -109 |
| 26 | 41 |
| 27 | -9 |
| 28 | 1 |
| 29 | 1 |
| 30 | -11 |
| 31 | 61 |
| 32 | -203 |
| 33 | 457 |
| 34 | -731 |
| 35 | 853 |
| 36 | -731 |
| 37 | 457 |
| 38 | -203 |
| 39 | 61 |
| 40 | -11 |
| 41 | 1 |
| 42 | 1 |
| 43 | -15 |
| 44 | 113 |
| 45 | -527 |
| 46 | 1713 |
| 47 | -4111 |
| 48 | 7537 |
| 49 | -10767 |
| 50 | 12113 |
| 51 | -10767 |
| 52 | 7537 |
| 53 | -4111 |
| 54 | 1713 |
| 55 | -527 |
| 56 | 113 |
| 57 | -15 |
| 58 | 1 |
| 59 | 1 |
| 60 | -17 |
| 61 | 145 |
| 62 | -773 |
| 63 | 2899 |
| 64 | -8117 |
| 65 | 17587 |