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A275065
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Number of permutations p of [n] such that p(i)-i is a multiple of ten for all i in [n].
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2
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 3072, 9216, 27648, 82944, 248832, 746496, 2239488, 6718464, 20155392, 60466176, 241864704, 967458816, 3869835264, 15479341056, 61917364224, 247669456896, 990677827584, 3962711310336
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OFFSET
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0,12
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LINKS
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FORMULA
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a(n) = Product_{i=0..9} floor((n+i)/10)!.
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MAPLE
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f:= n -> mul(floor((n+i)/10)!, i=0..9):
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MATHEMATICA
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Table[Product[Floor[(n + i)/10]!, {i, 0, 9}], {n, 0, 40}] (* Vaclav Kotesovec, Oct 02 2018 *)
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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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