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A224573
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Number of (n+5)X9 0..1 matrices with each 6X6 subblock idempotent
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1
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18868, 6411, 6659, 7394, 8143, 8714, 9164, 10807, 13624, 17332, 21731, 26592, 31785, 38491, 47899, 60907, 78205, 100219, 127312, 161005, 203975, 259809, 332836, 427756, 549639, 705073, 903350, 1157341, 1484238, 1905898, 2449315, 3148048
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 3*a(n-1) -4*a(n-2) +4*a(n-3) -3*a(n-4) +a(n-5) +2*a(n-6) -5*a(n-7) +6*a(n-8) -6*a(n-9) +4*a(n-10) -a(n-11) -a(n-12) +2*a(n-13) -2*a(n-14) +2*a(n-15) -a(n-16) for n>20
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EXAMPLE
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Some solutions for n=2
..1..0..0..0..0..0..0..0..0....1..1..1..1..1..1..1..0..0
..1..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..1..0..0..0..1..1..0....0..0..0..0..0..0..0..0..0
..0..0..1..0..0..0..1..1..0....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..1..0..0..0..1..1..0....0..0..0..0..0..0..0..0..0
..1..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
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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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