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 A152907 Irregular triangle read by rows, numbers in A007318 repeated four times . 0
 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 4, 4, 6, 6, 6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 5, 5, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 6, 6, 6, 6, 15, 15, 15, 15, 20, 20 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,17 LINKS FORMULA Sum_{k, 0<=k<=4n+3}T(n,k)=2^(n+2). EXAMPLE Triangle begins : 1,1,1,1 ; 1,1,1,1,1,1,1,1 ; 1,1,1,1,2,2,2,2,1,1,1,1 ; 1,1,1,1,3,3,3,3,3,3,3,3,1,1,1,1, ; 1,1,1,1,4,4,4,4,6,6,6,6,4,4,4,4,1,1,1,1 ; 1,1,1,1,5,5,5,5,10,10,10,10,10,10,10,10,5,5,5,5,1,1,1,1 ; ... CROSSREFS Cf. A007318, A152905, A152906 Sequence in context: A130836 A279185 A161385 * A078786 A102677 A145884 Adjacent sequences:  A152904 A152905 A152906 * A152908 A152909 A152910 KEYWORD nonn,tabf AUTHOR Philippe Deléham, Dec 14 2008 STATUS approved

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Last modified June 14 15:06 EDT 2021. Contains 345025 sequences. (Running on oeis4.)