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 A127626 Triangle T(n,k) = A018804(k) if k|n, else T(n,k)=0. 1
 1, 1, 3, 1, 0, 5, 1, 3, 0, 8, 1, 0, 0, 0, 9, 1, 3, 5, 0, 0, 15, 1, 0, 0, 0, 0, 0, 13, 1, 3, 0, 8, 0, 0, 0, 20, 1, 0, 5, 0, 0, 0, 0, 0, 21, 1, 3, 0, 0, 9, 0, 0, 0, 0, 27, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 21, 1, 3, 5, 8, 0, 15, 0, 0, 0, 0, 0, 40, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 25 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Inverse Mobius transform of a matrix with A018804 in the main diagonal and the rest zeros. LINKS Reinhard Zumkeller, Rows n = 1..125 of triangle, flattened EXAMPLE First few rows of the triangle are: 1; 1, 3; 1, 0, 5; 1, 3, 0, 8; 1, 0, 0, 0, 9; 1, 3, 5, 0, 0, 15; ... PROG (Haskell) a127626 n k = a127626_tabl !! (n-1) !! (k-1) a127626_row n = a127626_tabl !! (n-1) a127626_tabl = map (map (\x -> if x == 0 then 0 else a018804 x)) a127093_tabl -- Reinhard Zumkeller, Jan 21 2014 CROSSREFS Cf. A051731, A038040 (row sums), A018804 (diagonal). Cf. A127093. Sequence in context: A187954 A119302 A134560 * A245095 A154791 A121440 Adjacent sequences: A127623 A127624 A127625 * A127627 A127628 A127629 KEYWORD nonn,tabl,easy AUTHOR Gary W. Adamson, Jan 20 2007 STATUS approved

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Last modified May 31 11:08 EDT 2023. Contains 363066 sequences. (Running on oeis4.)