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Search: id:A108235
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| A108235 |
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Number of 3 X 3 magic squares with each cell value less than n. |
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+0
1
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| 8, 16, 40, 64, 96, 128, 184, 240, 320, 400, 504, 608, 744, 880, 1056, 1232, 1440, 1648, 1904, 2160, 2464, 2768, 3120, 3472, 3880, 4288, 4760, 5232, 5760, 6288, 6888, 7488, 8160, 8832, 9576, 10320, 11144, 11968, 12880, 13792, 14784, 15776
(list; graph; listen)
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OFFSET
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10,1
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LINKS
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M. Beck and T. Zaslavsky, An enumerative geometry for magic and magilatin labelings
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PROGRAM
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(PARI) a(n)=1/6*(n^3-16*n^2+(76-3*(n%2))*n-[96, 58, 96, 102, 112, 90, 96, 70, 96, 90, 112, 102][(n%12)+1])
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CROSSREFS
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Sequence in context: A156331 A024700 A108576 this_sequence A052207 A038578 A155110
Adjacent sequences: A108232 A108233 A108234 this_sequence A108236 A108237 A108238
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KEYWORD
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nonn
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AUTHOR
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Ralf Stephan, Jun 17 2005
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