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A111811 as a simple table

na(n)
00
11
22
310
488
51096
611856
7-402480
8-1891968
936024603264
10359905478400
11-53686393014816000
12-644141701131494400
131790653231402788752593920
1425068910772059830672353280
15-1280832036591718248285105113241600

[0,1,2,10,88,1096,11856,-402480,-1891968,
 36024603264,359905478400,-53686393014816000,
 -644141701131494400,1790653231402788752593920,
 25068910772059830672353280,
 -1280832036591718248285105113241600]