A228954 - OEIS

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A228954 as a simple table

n	a(n)
0	1
1	7
2	11
3	7
4	19
5	337
6	5
7	-1681
8	22133
9	-87223
10	427291
11	-118181363
12	4276553
13	-11874730297
14	4307920641583
15	-3854660520481
16	1288843929185
17	-13157635776526258889
18	1464996956920781
19	-130541359248224557643

[1,7,11,7,19,337,5,-1681,22133,-87223,427291, -118181363,4276553,-11874730297,4307920641583, -3854660520481,1288843929185, -13157635776526258889,1464996956920781, -130541359248224557643]