A009280 - OEIS

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A009280 as a simple table

n	a(n)
0	1
1	1
2	0
3	1
4	-3
5	11
6	-54
7	295
8	-1859
9	13057
10	-100804
11	840841
12	-7439935
13	68148731
14	-620549058
15	5116464431
16	-25440998439
17	-377177742815
18	19125593995896
19	-562210227462223
20	14622324046506341
21	-367386349871225269

[1,1,0,1,-3,11,-54,295,-1859,13057,-100804,840841, -7439935,68148731,-620549058,5116464431, -25440998439,-377177742815,19125593995896, -562210227462223,14622324046506341, -367386349871225269]