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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -11 |
| 3 | -50 |
| 4 | -186 |
| 5 | -631 |
| 6 | -2029 |
| 7 | -6299 |
| 8 | -19075 |
| 9 | -56704 |
| 10 | -166164 |
| 11 | -481391 |
| 12 | -1381691 |
| 13 | -3935125 |
| 14 | -11134331 |
| 15 | -31328366 |
| 16 | -87721614 |
| 17 | -244588519 |
| 18 | -679429225 |
| 19 | -1881102959 |
| 20 | -5192705779 |
| 21 | -14296088956 |
| 22 | -39263958696 |
| 23 | -107601905375 |
| 24 | -294291714551 |
| 25 | -803416991401 |
[1,-1,-11,-50,-186,-631,-2029,-6299,-19075,-56704, -166164,-481391,-1381691,-3935125,-11134331, -31328366,-87721614,-244588519,-679429225, -1881102959,-5192705779,-14296088956,-39263958696, -107601905375,-294291714551,-803416991401] |