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 A152905 Irregular triangle read by rows, numbers in A007318 repeated . 2
 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 4, 4, 6, 6, 4, 4, 1, 1, 1, 1, 5, 5, 10, 10, 10, 10, 5, 5, 1, 1, 1, 1, 6, 6, 15, 15, 20, 20, 15, 15, 6, 6, 1, 1, 1, 1, 7, 7, 21, 21, 35, 35, 35, 35, 21, 21, 7, 7, 1, 1, 1, 1, 8, 8, 28, 28, 56, 56, 70, 70, 56, 56, 28, 28, 8, 8, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,9 COMMENTS Diagonal sums : A097333 . LINKS Table of n, a(n) for n=0..89. FORMULA Sum_{k, 0<=k<=2n}T(n,k)=2^(n+1). EXAMPLE Triangle begins : 1,1 ; 1,1,1,1 ; 1,1,2,2,1,1 ; 1,1,3,3,3,3,1,1, ; 1,1,4,4,6,6,4,4,1,1 ; 1,1,5,5,10,10,10,10,5,5,1,1 ; ... CROSSREFS Cf. A000079, Sequence in context: A211999 A175025 A076899 * A096601 A078077 A078082 Adjacent sequences: A152902 A152903 A152904 * A152906 A152907 A152908 KEYWORD nonn,tabf AUTHOR Philippe Deléham, Dec 14 2008 EXTENSIONS Typo in a(74) corrected by Georg Fischer, May 26 2024 STATUS approved

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Last modified August 12 09:35 EDT 2024. Contains 375092 sequences. (Running on oeis4.)