A110708 - OEIS

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A110708 as a simple table

n	a(n)
0	0
1	1
2	-1
3	0
4	2
5	8
6	-64
7	-112
8	2064
9	8192
10	-157056
11	-599808
12	16072704
13	80010240
14	-2484268032
15	-13537247232
16	506459129856
17	3160676007936
18	-135526008225792
19	-929451393220608
20	45507663438741504

[0,1,-1,0,2,8,-64,-112,2064,8192,-157056,-599808, 16072704,80010240,-2484268032,-13537247232, 506459129856,3160676007936,-135526008225792, -929451393220608,45507663438741504]