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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, 88, 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..88.

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

STATUS

approved

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Last modified July 28 17:15 EDT 2021. Contains 346335 sequences. (Running on oeis4.)