A152480 - OEIS

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A152480 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	6
7	36
8	648
9	49248
10	25214976
11	160821116928
12	27931733230288896
13	356677116520963546939392
14	1187172652051836115416531874086912
15	5150511748819234946137723863013776583789903872

[1,1,1,1,2,6,36,648,49248,25214976,160821116928, 27931733230288896,356677116520963546939392, 1187172652051836115416531874086912, 5150511748819234946137723863013776583789903872]