A272424 - OEIS

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A272424 as a simple table

n	a(n)
0	1
1	4
2	32
3	164
4	724
5	3216
6	13608
7	55092
8	222620
9	886928
10	3540896
11	14161580
12	56627040
13	226325460
14	905090160
15	3619558696

[1,4,32,164,724,3216,13608,55092,222620,886928, 3540896,14161580,56627040,226325460,905090160, 3619558696]