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Search: id:A047916
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| A047916 |
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Triangular array a(n,k) = phi(n/k)*(n/k)^k*k! if k|n else 0 (1<=k<=n). |
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+0
7
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| 1, 2, 2, 6, 0, 6, 8, 8, 0, 24, 20, 0, 0, 0, 120, 12, 36, 48, 0, 0, 720, 42, 0, 0, 0, 0, 0, 5040, 32, 64, 0, 384, 0, 0, 0, 40320, 54, 0, 324, 0, 0, 0, 0, 0, 362880, 40, 200, 0, 0, 3840, 0, 0, 0, 0, 3628800, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 39916800, 48, 144
(list; table; graph; listen)
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OFFSET
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1,2
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REFERENCES
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J. E. A. Steggall, On the numbers of patterns which can be derived from certain elements, Mess. Math., 37 (1907), 56-61.
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EXAMPLE
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1; 2,2; 6,0,6; 8,8,0,24; 20,0,0,0,120; 12,36,48,0,0,720; ...
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CROSSREFS
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A064649 gives the row sums.
Sequence in context: A091085 A011144 A127649 this_sequence A101207 A155818 A010245
Adjacent sequences: A047913 A047914 A047915 this_sequence A047917 A047918 A047919
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KEYWORD
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nonn,tabl,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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