A010738 - OEIS

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A010738 as a simple table

n	a(n)
0	1
1	1
2	-2
3	3
4	-7
5	22
6	-71
7	231
8	-794
9	2945
10	-11679
11	48770
12	-212823
13	969221
14	-4605674
15	22802431
16	-117322423
17	625743878
18	-3452893503
19	19684083947
20	-115787084242
21	701935339725
22	-4380330298815
23	28105726916034

[1,1,-2,3,-7,22,-71,231,-794,2945,-11679,48770, -212823,969221,-4605674,22802431,-117322423, 625743878,-3452893503,19684083947,-115787084242, 701935339725,-4380330298815,28105726916034]