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A062206
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a(n) = n^(2n).
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26
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1, 1, 16, 729, 65536, 9765625, 2176782336, 678223072849, 281474976710656, 150094635296999121, 100000000000000000000, 81402749386839761113321, 79496847203390844133441536, 91733330193268616658399616009, 123476695691247935826229781856256
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refs;
listen;
history;
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internal format)
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OFFSET
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0,3
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COMMENTS
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a(n) is also the number of sequences of length 2n on n symbols. - Washington Bomfim, Oct 06 2009
a(n) is the number of endofunctions on [n] that map each even number to an even number and each odd number to an odd number. - Enrique Navarrete, Sep 30 2022
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LINKS
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FORMULA
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(-1)^n*determinant of the 2n X 2n matrix M_(i, j) = i+j if (i + j) is a multiple of n, M_(i, j) = 1 otherwise. - Benoit Cloitre, Aug 06 2003
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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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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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