The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 2 |
| 8 | -1 |
| 9 | 0 |
| 10 | 4 |
| 11 | -6 |
| 12 | 6 |
| 13 | 6 |
| 14 | -24 |
| 15 | 38 |
| 16 | -17 |
| 17 | -64 |
| 18 | 188 |
| 19 | -230 |
| 20 | -6 |
| 21 | 662 |
| 22 | -1432 |
| 23 | 1286 |
| 24 | 1210 |
| 25 | -6362 |
| 26 | 10692 |
| 27 | -5530 |
| 28 | -18274 |
| 29 | 57022 |
| 30 | -74364 |
| 31 | 174 |
| 32 | 216703 |
| 33 | -489544 |
| 34 | 467860 |
| 35 | 391258 |
| 36 | -2256430 |
| 37 | 3948206 |
| 38 | -2234064 |
| 39 | -6725362 |
| 40 | 21920402 |
| 41 | -29716570 |
| 42 | 2095564 |
| 43 | 84595798 |
| 44 | -198418242 |
| 45 | 197499846 |
[1,1,0,1,0,0,2,-1,0,4,-6,6,6,-24,38,-17,-64,188, -230,-6,662,-1432,1286,1210,-6362,10692,-5530, -18274,57022,-74364,174,216703,-489544,467860, 391258,-2256430,3948206,-2234064,-6725362, 21920402,-29716570,2095564,84595798,-198418242, 197499846] |