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 A137948 Triangle read by rows, A000012 * A136579. 6
 1, 2, 1, 3, 2, 2, 4, 3, 4, 6, 5, 4, 6, 12, 24, 6, 5, 8, 18, 48, 120, 7, 6, 10, 24, 72, 240, 720, 8, 7, 12, 30, 96, 360, 1440, 5040, 9, 8, 14, 36, 120, 480, 2160, 10080, 40320, 10, 9, 16, 42, 144, 600, 2880, 15120, 80640, 362880 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums = A014144 starting (1, 3, 7, 17, 51, 205, ...). T(n,k) = A245334(n,k) / A007318(n,k), 0 <= k <= n. - Reinhard Zumkeller, Aug 31 2014 LINKS Reinhard Zumkeller, Rows n = 0..125 of triangle, flattened FORMULA As infinite lower triangular matrices, A000012 * A136579, where A000012 = (1; 1,1; 1,1,1; ...) and A136579 = (1; 1,1; 1,1,2; 1,1,2,6; 1,1,2,6,24; ...). T(n,k) = (n+1-k) * k! for 0 <= k <= n. - Werner Schulte, Oct 06 2020 EXAMPLE First few rows of the triangle: 1; 2, 1; 3, 2, 2; 4, 3, 4, 6; 5, 4, 6, 12, 24; 6, 5, 8, 18, 48, 120; 7, 6, 10, 24, 72, 240, 720; ... PROG (Haskell) a137948 n k = a137948_tabl !! n !! k a137948_row n = a137948_tabl !! n a137948_tabl = zipWith (zipWith div) a245334_tabl a007318_tabl -- Reinhard Zumkeller, Aug 31 2014 CROSSREFS Cf. A136579, A014144. Cf. A245334, A007318. Sequence in context: A144329 A141157 A357213 * A210553 A269456 A208906 Adjacent sequences: A137945 A137946 A137947 * A137949 A137950 A137951 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Feb 28 2008 EXTENSIONS Offset changed by Reinhard Zumkeller, Aug 31 2014 STATUS approved

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Last modified August 14 18:14 EDT 2024. Contains 375166 sequences. (Running on oeis4.)