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A085534
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a(n) = (2n)^(2n).
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7
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1, 4, 256, 46656, 16777216, 10000000000, 8916100448256, 11112006825558016, 18446744073709551616, 39346408075296537575424, 104857600000000000000000000, 341427877364219557396646723584, 1333735776850284124449081472843776, 6156119580207157310796674288400203776
(list;
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listen;
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internal format)
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OFFSET
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0,2
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COMMENTS
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All terms are both perfect squares and numbers of the form n^n. - William Boyles, Jul 31 2015
The number of sequences of length 2n using 2n symbols. - Washington Bomfim, Jan 14 2020
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(Python)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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