A156929 - OEIS

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A156929 as a simple table

n	a(n)
2	-6
3	-79
4	-515
5	-2255
6	-7321
7	-17280
8	-20052
9	73530
10	683280
11	3482667
12	14574887
13	55023247
14	194872885
15	661036370
16	2174736558
17	6996176016
18	22133771190
19	69145507605
20	213941135265
21	657095902685

[-6,-79,-515,-2255,-7321,-17280,-20052,73530, 683280,3482667,14574887,55023247,194872885, 661036370,2174736558,6996176016,22133771190, 69145507605,213941135265,657095902685]