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 A124846 Triangle read by rows: T(n,k) = (2 - (-1)^k)*binomial(n,k) (0 <= k <= n). 1
 1, 1, 3, 1, 6, 1, 1, 9, 3, 3, 1, 12, 6, 12, 1, 1, 15, 10, 30, 5, 3, 1, 18, 15, 60, 15, 18, 1, 1, 21, 21, 105, 35, 63, 7, 3, 1, 24, 28, 168, 70, 168, 28, 24, 1, 1, 27, 36, 252, 126, 378, 84, 108, 9, 3, 1, 30, 45, 360, 210, 756, 210, 360, 45, 30, 1, 1, 33, 55, 495, 330, 1386, 462, 990 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..73. EXAMPLE First few rows of the triangle: 1; 1, 3; 1, 6, 1; 1, 9, 3, 3; 1, 12, 6, 12, 1; 1, 15, 10, 30, 5, 3; ... A046055(4) = 16 = sum of row 4 terms (1 + 9 + 3 + 3). MAPLE T:=(n, k)->(2-(-1)^k)*binomial(n, k): for n from 0 to 12 do seq(T(n, k), k=0..n) od; # yields sequence in triangular form CROSSREFS Cf. A010684, A046055, A124845. Sequence in context: A347231 A213670 A116609 * A177375 A099512 A127096 Adjacent sequences: A124843 A124844 A124845 * A124847 A124848 A124849 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Nov 10 2006 EXTENSIONS Edited by N. J. A. Sloane, Nov 24 2006 STATUS approved

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Last modified June 9 23:59 EDT 2023. Contains 363183 sequences. (Running on oeis4.)