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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | -1 |
| 6 | -1 |
| 7 | -1 |
| 8 | -1 |
| 9 | -1 |
| 10 | -2 |
| 11 | -3 |
| 12 | -5 |
| 13 | -7 |
| 14 | -10 |
| 15 | -14 |
| 16 | -20 |
| 17 | -29 |
| 18 | -42 |
| 19 | -61 |
| 20 | -88 |
| 21 | -127 |
| 22 | -183 |
| 23 | -264 |
| 24 | -381 |
| 25 | -550 |
| 26 | -794 |
| 27 | -1146 |
| 28 | -1654 |
| 29 | -2387 |
| 30 | -3445 |
| 31 | -4972 |
| 32 | -7176 |
| 33 | -10357 |
| 34 | -14948 |
| 35 | -21574 |
| 36 | -31137 |
| 37 | -44939 |
| 38 | -64859 |
| 39 | -93609 |
| 40 | -135103 |
| 41 | -194990 |
| 42 | -281423 |
| 43 | -406169 |
| 44 | -586211 |
| 45 | -846060 |
| 46 | -1221092 |
| 47 | -1762364 |