The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 1 |
| 3 | -4 |
| 4 | 0 |
| 5 | 9 |
| 6 | -1 |
| 7 | -20 |
| 8 | 1 |
| 9 | 38 |
| 10 | 1 |
| 11 | -64 |
| 12 | -2 |
| 13 | 107 |
| 14 | -2 |
| 15 | -180 |
| 16 | 3 |
| 17 | 292 |
| 18 | 4 |
| 19 | -452 |
| 20 | -4 |
| 21 | 686 |
| 22 | -5 |
| 23 | -1044 |
| 24 | 5 |
| 25 | 1563 |
| 26 | 6 |
| 27 | -2276 |
| 28 | -8 |
| 29 | 3284 |
| 30 | -9 |
| 31 | -4724 |
| 32 | 12 |
| 33 | 6712 |
| 34 | 13 |
| 35 | -9408 |
| 36 | -14 |
| 37 | 13086 |
| 38 | -17 |
| 39 | -18112 |
| 40 | 18 |
| 41 | 24879 |
| 42 | 21 |
| 43 | -33864 |
| 44 | -26 |
| 45 | 45806 |
| 46 | -28 |
| 47 | -61696 |
| 48 | 34 |
| 49 | 82614 |
| 50 | 39 |
| 51 | -109892 |
[1,3,1,-4,0,9,-1,-20,1,38,1,-64,-2,107,-2,-180,3, 292,4,-452,-4,686,-5,-1044,5,1563,6,-2276,-8,3284, -9,-4724,12,6712,13,-9408,-14,13086,-17,-18112,18, 24879,21,-33864,-26,45806,-28,-61696,34,82614,39, -109892] |