The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | 2 |
| 3 | -11 |
| 4 | 4 |
| 5 | -11 |
| 6 | 6 |
| 7 | -39 |
| 8 | 8 |
| 9 | -49 |
| 10 | 10 |
| 11 | 647 |
| 12 | 12 |
| 13 | -5487 |
| 14 | 14 |
| 15 | 929329 |
| 16 | 16 |
| 17 | -3202325 |
| 18 | 18 |
| 19 | 221930505 |
| 20 | 20 |
| 21 | -4722116563 |
| 22 | 22 |
| 23 | 968383680643 |
| 24 | 24 |
| 25 | -14717667114201 |
| 26 | 26 |
| 27 | 2093660879252563 |
| 28 | 28 |
| 29 | -86125672563201239 |
| 30 | 30 |
| 31 | 129848163681107300961 |
| 32 | 32 |
[1,-3,2,-11,4,-11,6,-39,8,-49,10,647,12,-5487,14, 929329,16,-3202325,18,221930505,20,-4722116563,22, 968383680643,24,-14717667114201,26, 2093660879252563,28,-86125672563201239,30, 129848163681107300961,32] |