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A016987
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a(n) = (7*n)^7.
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2
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0, 823543, 105413504, 1801088541, 13492928512, 64339296875, 230539333248, 678223072849, 1727094849536, 3938980639167, 8235430000000, 16048523266853, 29509034655744, 51676101935731
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = 8*a(n-1) - 28*a(n-2) + 56*a(n-3) - 70*a(n-4) + 56*a(n-5) - 28*a(n-6) + 8*a(n-7) - a(n-8); a(0)=0, a(1)=823543, a(2)=105413504, a(3)=1801088541, a(4)=13492928512, a(5)=64339296875, a(6)=230539333248, a(7)=678223072849. - Harvey P. Dale, Apr 01 2013
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MATHEMATICA
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(7*Range[0, 20])^7 (* or *) LinearRecurrence[{8, -28, 56, -70, 56, -28, 8, -1}, {0, 823543, 105413504, 1801088541, 13492928512, 64339296875, 230539333248, 678223072849}, 20] (* Harvey P. Dale, Apr 01 2013 *)
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PROG
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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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