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A079621
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Matrix square of unsigned Lah-triangle |A008297(n,k}|.
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1
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1, 4, 1, 24, 12, 1, 192, 144, 24, 1, 1920, 1920, 480, 40, 1, 23040, 28800, 9600, 1200, 60, 1, 322560, 483840, 201600, 33600, 2520, 84, 1, 5160960, 9031680, 4515840, 940800, 94080, 4704, 112, 1, 92897280, 185794560, 108380160, 27095040, 3386880, 225792
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..42.
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FORMULA
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E.g.f.: exp(x*y/(1-2*x)).
T(n, k) = n!/k!*binomial(n-1, k-1)*2^(n-k). - Vladeta Jovovic, Sep 24 2003
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EXAMPLE
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1; 4,1; 24,12,1; 192,144,24,1; 1920,1920,480,40,1; ...
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CROSSREFS
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Cf. A002866(first column), A025168(row sums).
Sequence in context: A128417 A183875 A136232 * A046860 A089505 A062328
Adjacent sequences: A079618 A079619 A079620 * A079622 A079623 A079624
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KEYWORD
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nonn,tabl,changed
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AUTHOR
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Vladeta Jovovic, Jan 29 2003
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STATUS
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approved
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