A064311 - OEIS

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A064311 as a simple table

n	a(n)
0	1
1	1
2	-1
3	5
4	-25
5	141
6	-849
7	5349
8	-34825
9	232445
10	-1582081
11	10938709
12	-76616249
13	542472685
14	-3876400305
15	27919883205
16	-202480492905
17	1477306676445
18	-10836099051105
19	79861379898165
20	-591082795606425

[1,1,-1,5,-25,141,-849,5349,-34825,232445, -1582081,10938709,-76616249,542472685,-3876400305, 27919883205,-202480492905,1477306676445, -10836099051105,79861379898165,-591082795606425]

[1,1,-1,5,-25,141,-849,5349,-34825,232445,
 -1582081,10938709,-76616249,542472685,-3876400305,
 27919883205,-202480492905,1477306676445,
 -10836099051105,79861379898165,-591082795606425]