A004379 - OEIS

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A004379 as a simple table

n	a(n)
11	1
12	84
13	4095
14	152096
15	4780230
16	134153712
17	3470108187
18	84431259000
19	1959267085776
20	43790762164380
21	949517708685546
22	20082459351180240
23	416047580521136200
24	8470484585302467168
25	169921950043809807675

[1,84,4095,152096,4780230,134153712,3470108187, 84431259000,1959267085776,43790762164380, 949517708685546,20082459351180240, 416047580521136200,8470484585302467168, 169921950043809807675]