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A006936
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Moebius transform of numbers of preferential arrangements.
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1
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0, 1, 0, 2, 12, 74, 538, 4682, 47280, 545832, 7087186, 102247562, 1622632020, 28091567594, 526858343698, 10641342970366, 230283190930560, 5315654681981354, 130370767028589528, 3385534663256845322
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Moebius transform of A000670(n-1)=[1,1,3,13,75,...] is a(n)=[1,0,2,12,74,...]. - Michael Somos Mar 04 2004
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LINKS
| N. J. A. Sloane, Transforms
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PROG
| (PARI) a(n)=if(n<1, 0, sumdiv(n, d, moebius(n/d)*(d-1)!*polcoeff(1/(2-exp(x+O(x^d))), d-1)))
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CROSSREFS
| Cf. A000670.
Sequence in context: A078469 A014351 A074616 * A052875 A037725 A037620
Adjacent sequences: A006933 A006934 A006935 * A006937 A006938 A006939
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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