A144004 - OEIS

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A144004 as a simple table

n	a(n)
0	1
1	1
2	4
3	44
4	856
5	24664
6	958592
7	47463936
8	2881313024
9	208638075392
10	17654019768320
11	1717961286944768
12	189836122499649536
13	23574107397852049408
14	3261667682403085852672
15	499151625979680748978176

[1,1,4,44,856,24664,958592,47463936,2881313024, 208638075392,17654019768320,1717961286944768, 189836122499649536,23574107397852049408, 3261667682403085852672,499151625979680748978176]