A278035 - OEIS

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A278035 as a simple table

n	a(n)
1	3
2	-4
3	64
4	-253
5	4292
6	-25608
7	442008
8	-3202512
9	56565002
10	-457852636
11	8250107250
12	-71585012513
13	1313205529004
14	-11929616869396
15	222527122219040
16	-2085032711731864
17	39524158910209535
18	-378082239815999340

[3,-4,64,-253,4292,-25608,442008,-3202512, 56565002,-457852636,8250107250,-71585012513, 1313205529004,-11929616869396,222527122219040, -2085032711731864,39524158910209535, -378082239815999340]