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Search: id:A123707
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| 1, 0, 1, 3, 7, 14, 31, 60, 126, 248, 511, 1005, 2047, 4064, 8183, 16320, 32767, 65394, 131071, 261885, 524255, 1048064, 2097151, 4193220, 8388600, 16775168, 33554304, 67104765, 134217727, 268427002, 536870911, 1073725440, 2147483135
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OFFSET
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1,4
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COMMENT
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Triangle A123706 is the matrix inverse of triangle A010766(n,k) = [n/k].
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PROGRAM
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(PARI) {a(n)=sum(k=1, n, (matrix(n, n, r, c, if(r>=c, floor(r/c)))^-1)[n, k]*2^(k-1))}
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CROSSREFS
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Cf. A123706, A123708, A123709.
Sequence in context: A066225 A139817 A036892 this_sequence A011947 A129629 A089526
Adjacent sequences: A123704 A123705 A123706 this_sequence A123708 A123709 A123710
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Oct 09 2006
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