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 A105587 Row sums of a Möbius-binomial triangle. 1
 1, 2, 3, 4, 1, 6, 7, 8, 2, 3, 11, 12, 4, 14, 15, 16, 5, 18, 6, 20, 7, 22, 23, 24, 8, 9, 27, 10, 11, 30, 31, 32, 12, 34, 35, 36, 13, 38, 39, 40, 14, 42, 43, 44, 15, 16, 47, 48, 17, 18, 19, 52, 20, 54, 21, 56, 22, 58, 59, 60, 23, 62, 63, 24, 25, 66, 67, 68, 26, 70, 71, 72, 27, 74, 75 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(n) = n unless n is nonsquarefree, in which case a(n) = rank of n as a nonsquarefree number. Row sums of A105586. LINKS FORMULA a(n) = Sum_{k=0..n} binomial(abs(mu(n)), abs(mu(k))). EXAMPLE a(4) = 1 since 4 is the first nonsquarefree number; a(8) = 2 since 8 is the second nonsquarefree number. CROSSREFS Sequence in context: A001438 A342410 A345937 * A345998 A319676 A049073 Adjacent sequences: A105584 A105585 A105586 * A105588 A105589 A105590 KEYWORD easy,nonn AUTHOR Paul Barry, Apr 14 2005 STATUS approved

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Last modified March 30 19:10 EDT 2023. Contains 361622 sequences. (Running on oeis4.)