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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | -3 |
| 3 | 36 |
| 4 | -150 |
| 5 | 1131 |
| 6 | -6975 |
| 7 | 50349 |
| 8 | -353001 |
| 9 | 2598993 |
| 10 | -19218273 |
| 11 | 145002066 |
| 12 | -1103619348 |
| 13 | 8494014009 |
| 14 | -65879935581 |
| 15 | 514828933092 |
| 16 | -4048045183590 |
| 17 | 32008577419905 |
| 18 | -254337177982545 |
| 19 | 2029871382481236 |
| 20 | -16264438160161098 |
| 21 | 130785869141097201 |
[1,3,-3,36,-150,1131,-6975,50349,-353001,2598993, -19218273,145002066,-1103619348,8494014009, -65879935581,514828933092,-4048045183590, 32008577419905,-254337177982545,2029871382481236, -16264438160161098,130785869141097201] |