A144322 - OEIS

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A144322 as a simple table

n	a(n)
1	1
2	1
3	256
4	65536
5	16809856
6	4303323136
7	1101667434496
8	282026863230976
9	72198881268083456
10	18482913606768459776
11	4731625884430073102336
12	1211296226414098714198016
13	310091833962291289108054016

[1,1,256,65536,16809856,4303323136,1101667434496, 282026863230976,72198881268083456, 18482913606768459776,4731625884430073102336, 1211296226414098714198016, 310091833962291289108054016]