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A344113
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a(n) = 2^(n^2) - n^n.
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5
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1, 12, 485, 65280, 33551307, 68719430080, 562949952597769, 18446744073692774400, 2417851639229257961991863, 1267650600228229401486703205376, 2658455991569831745807613835249018541, 22300745198530623141535718272639445405532160
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OFFSET
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1,2
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COMMENTS
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a(n) is the number of relations on a set with n elements that are not functions.
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LINKS
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EXAMPLE
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a(1) = 2^(1^2) - 1^1 = 1.
a(2) = 2^(2^2) - 2^2 = 12.
a(3) = 2^(3^2) - 3^3 = 485.
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MATHEMATICA
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Table[2^(n^2) - n^n, {n, 12}] // Flatten
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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