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A083474
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T(n)^2-n!, where T(n) is the n-th triangular number.
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1
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0, 7, 30, 76, 105, -279, -4256, -39024, -360855, -3625775, -39912444, -478995516, -6227012519, -87178280175, -1307674353600, -20922789869504, -355687428072591, -6402373705698759, -121645100408795900, -2432902008176595900, -51090942171709386639
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(3)=T(3)^2-3!=6^2-6=36-6=30
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MATHEMATICA
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PROG
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(PARI) t(n)=n*(n+1)/2 for(i=1, 50, print1(", "t(i)^2-i!))
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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Corrected by Harvey P. Dale, Nov 23 2011
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STATUS
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approved
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