A016031 - OEIS

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A016031 as a simple table

n	a(n)
1	1
2	1
3	2
4	16
5	2048
6	67108864
7	144115188075855872
8	1329227995784915872903807060280344576
9	226156424291633194186662080095093570025917938800079226639565593765455331328

[1,1,2,16,2048,67108864,144115188075855872, 1329227995784915872903807060280344576, 22615642429163319418666208009509357002591793880007\ 9226639565593765455331328]