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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 2 |
| 5 | -6 |
| 6 | 16 |
| 7 | -48 |
| 8 | 155 |
| 9 | -506 |
| 10 | 1706 |
| 11 | -5888 |
| 12 | 20608 |
| 13 | -73152 |
| 14 | 262672 |
| 15 | -951929 |
| 16 | 3478158 |
| 17 | -12798568 |
| 18 | 47384216 |
| 19 | -176387016 |
| 20 | 659776638 |
| 21 | -2478574412 |
| 22 | 9347514586 |
| 23 | -35376839998 |
| 24 | 134317287748 |
| 25 | -511463365764 |
| 26 | 1952816800973 |
| 27 | -7474463834606 |
| 28 | 28673987914262 |
| 29 | -110233267218581 |
| 30 | 424608422717362 |
| 31 | -1638541384230970 |
| 32 | 6333831090142919 |
| 33 | -24522697340016084 |
| 34 | 95086658516947002 |
[1,1,-1,2,-6,16,-48,155,-506,1706,-5888,20608, -73152,262672,-951929,3478158,-12798568,47384216, -176387016,659776638,-2478574412,9347514586, -35376839998,134317287748,-511463365764, 1952816800973,-7474463834606,28673987914262, -110233267218581,424608422717362, -1638541384230970,6333831090142919, -24522697340016084,95086658516947002] |