A006309 - OEIS

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A006309 as a simple table

n	a(n)
2	1
3	5
4	-21
5	33
6	-65
7	85
8	-133
9	161
10	261
11	-341
12	-481
13	533
14	-645
15	705
16	901
17	-12803
18	-1281
19	-1541
20	1633
21	-1825
22	-14615
23	-11537
24	2581
25	-3201
26	3333

[1,5,-21,33,-65,85,-133,161,261,-341,-481,533, -645,705,901,-12803,-1281,-1541,1633,-1825,-14615, -11537,2581,-3201,3333]