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Search: id:A159667
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| 1, 2, 6, 26, 133, 905, 6521, 57126, 544820, 5878219, 66851119, 881424550, 11803494823, 175906313032, 2767829058956, 47008174824136, 821285150996811, 15816596073011143, 308160754687446289, 6498330632792677804
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OFFSET
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1,2
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COMMENT
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a(n) is divisible by n, for all n >= 1.
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MATHEMATICA
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f[n_] := f[n] = Sum[Binomial[n, k] GCD[n, k] f[k - 1], {k, n}]; f[0] = 1; Table[f@n/n, {n, 22}] [From Robert G. Wilson v (rgwv(AT)rgwv.com), May 27 2009]
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CROSSREFS
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A159666
Adjacent sequences: A159664 A159665 A159666 this_sequence A159668 A159669 A159670
Sequence in context: A030850 A030951 A030876 this_sequence A030957 A030898 A002788
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Apr 19 2009
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), May 27 2009
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