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A038279
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Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*1^j.
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2
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1, 8, 1, 64, 16, 1, 512, 192, 24, 1, 4096, 2048, 384, 32, 1, 32768, 20480, 5120, 640, 40, 1, 262144, 196608, 61440, 10240, 960, 48, 1, 2097152, 1835008, 688128, 143360, 17920, 1344, 56, 1, 16777216, 16777216, 7340032, 1835008, 286720
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OFFSET
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0,2
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COMMENTS
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T(i,j) is the number of i-permutations of 9 objects a,b,c,d,e,f,g,h,i with repetition allowed, containing j a's. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 21 2007
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REFERENCES
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B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
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LINKS
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Table of n, a(n) for n=0..40.
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EXAMPLE
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1
8, 1
64, 16, 1
512, 192, 24, 1
4096, 2048, 384, 32, 1
32768, 20480, 5120, 640, 40, 1
262144, 196608, 61440, 10240, 960, 48, 1
2097152, 1835008, 688128, 143360, 17920, 1344, 56, 1
16777216, 16777216, 7340032, 1835008, 286720, 28672, 1792, 64, 1
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MAPLE
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for i from 0 to 8 do seq(binomial(i, j)*8^(i-j), j = 0 .. i) od; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 21 2007
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CROSSREFS
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Sequence in context: A050401 A089276 A051932 * A075503 A051379 A143499
Adjacent sequences: A038276 A038277 A038278 * A038280 A038281 A038282
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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